General Information
On 20th of August 2026 the following was released:
- ISL AlwaysOn 5.0.2551.150 for Windows (release_date=2026-08-20, revision=fc5c2b041100e3cd320f076d64ed487628683703, platform=win32, os_version=0x6010000-0x7fffffff)
- ISL AlwaysOn 5.0.2551.150 for Linux (release_date=2026-08-20, revision=fc5c2b041100e3cd320f076d64ed487628683703, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL AlwaysOn 5.0.2551.150 for macOS (release_date=2026-08-20, revision=fc5c2b041100e3cd320f076d64ed487628683703, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.150 for Windows (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=win32, os_version=0x06010000-0x7fffffff)
- ISL Light 5.0.2551.150 for macOS (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.150 for Linux (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Light Client 5.0.2551.150 for Windows (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=win32, os_version=0x06010000-0x7fffffff)
- ISL Light Client 5.0.2551.150 for macOS (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.150 for Linux (release_date=2026-08-20, build=fc5c2b041100e3cd320f076d64ed487628683703, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Player 5.0.2551.50 for Windows (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Player 5.0.2551.50 for macOS (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Player 5.0.2551.50 for Linux (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Pronto 5.0.2551.50 for Windows (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Pronto 5.0.2551.50 for macOS (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Pronto 5.0.2551.50 for Linux (release_date=2026-08-20, build=13121a38e8ca309620426dc1671866410fdc8482, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
This release is available for Hosted Service users.
Upgrading to new version
Hosted service users please check Upgrading Hosted Service.
Improvements
ISL AlwaysOn - Desktop - Build MbedTLS 4.1 (SECURITY) [ISLALWAYSON-2069] More
Description
Internal mbedTLS library was updated to version 4.1.0.
ISL AlwaysOn - Desktop - Remove SAS library (FEATURE) [ISLALWAYSON-2067] More
Description
The internal SAS library used for sending Secure Attention Sequence (Ctrl+Alt+Del) on Windows was replaced with the system SAS API. The bundled sas.dll is no longer copied during installation.
ISL AlwaysOn - Desktop - Prevent clipboard feedback loop (FEATURE) [ISLALWAYSON-2068] More
Description
Clipboard synchronization was updated to prevent a feedback loop where the same clipboard content could be repeatedly pushed back to the side that originated it. Each endpoint now tags its clipboard content with an origin identifier and ignores incoming content that matches its own tag.
ISL AlwaysOn - Desktop - Allow generic clipboard transfers to run when desktop streaming is not active (FEATURE) [ISLALWAYSON-2070] More
Description
Added support for clipboard transfers to continue working when desktop streaming is not active in ISL AlwaysOn session.
ISL AlwaysOn - Desktop - ISSC add support for generic clipboard (FEATURE) [ISLALWAYSON-2074] More
Description
Added support for generic clipboard operations (such as CTRL+C and CTRL+V) between the operator and remote computer on Windows. In addition to text, users can now copy and paste images and files through the clipboard during a remote session. Large clipboard content is transferred lazily through a dedicated channel to avoid blocking the session.
ISL AlwaysOn - Desktop - Post detailed user activity to icp (FEATURE) [ISLALWAYSON-2075] More
Description
Added support for reporting detailed user activity to ISL Conference Proxy. Each session and program-wide feature use is timestamped and streamed to ISL Conference Proxy. Program features are reported only once across concurrent sessions and already-acknowledged events are not resent.
ISL AlwaysOn - Desktop - Use system uname call instead of starting new process (FEATURE) [ISLALWAYSON-2077] More
Description
When querying OS information on Unix-based systems, ISL Light no longer starts a separate process to run the "uname" command. A direct system call is used instead, which is faster and more reliable.
ISL AlwaysOn - Desktop - Add audit to generic clipboard file transfer (FEATURE) [ISLALWAYSON-2078] More
Description
Generic clipboard file transfer now emits audit information so clipboard copy/paste activity between operator and client can be logged. Audit events include the item kind, name, path, size, direction (send or receive) and progress state (start, done or cancel when the transfer is aborted).
ISL AlwaysOn - Desktop - Skip notify on session with no logon on unix (DEFECT) [ISLALWAYSON-1816] More
Description
On macOS when no user was logged in, the notification window could still appear. Handling was updated so the logon notification is skipped when there is no active user session.
The defect was fixed.
ISL AlwaysOn - Desktop - Allow transferring more than 1 pdo object (DEFECT) [ISLALWAYSON-2071] More
Description
When transferring files via clipboard between operator and client, in some cases only one file could be transferred before the operation stalled. The implementation of the clipboard data object and stream cancellation was redesigned so that multiple objects can now be transferred reliably in a single paste operation.
The defect was fixed.
ISL AlwaysOn - Desktop - XZ LZMA Decoder failing when stream end is defined by size instead of EOS marker (DEFECT) [ISLALWAYSON-2072] More
Description
In some cases the XZ LZMA decoder failed when the compressed stream did not contain an end-of-stream marker and instead relied on the known uncompressed size to signal the end. Decoding was redesigned so that once all expected bytes have been produced the stream is correctly finalized, and such size-terminated streams now decode successfully.
The defect was fixed.
ISL AlwaysOn - Desktop - LIB fix timeout on reading of PDO (DEFECT) [ISLALWAYSON-2073] More
Description
When pasting content from the clipboard that was shared from the remote computer, the transfer could time out and fail on larger items because the internal read timeout was too short. The timeout handling was redesigned and the read chunk size was increased, so clipboard paste operations now complete reliably.
The defect was fixed.
ISL AlwaysOn - Desktop - Block Remote Input does not block multitouch gestures/touch (DEFECT) [ISLALWAYSON-2076] More
Description
Users experienced an issue where Block Remote Input did not block multitouch gestures and touch input on the remote computer. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL AlwaysOn - Desktop - Restart clipboard proxy on crash (DEFECT) [ISLALWAYSON-2080] More
Description
Users experienced an issue on Windows where the generic clipboard and remote control stopped working when the remote computer was at the logon screen, after the remote user logged out, or when the clipboard process crashed - and copying content in that state could leave the operator's mouse and keyboard input paused. The clipboard component is now supervised and restarted automatically (shortly after a crash, and once a user logs back in), and pending clipboard operations are always acknowledged so operator input never stays blocked.
The defect was fixed.
ISL Light - Desktop - Build MbedTLS 4.1 (SECURITY) [ISLLIGHT-7587] More
Description
Internal mbedTLS library was updated to version 4.1.0. The SSL MUX channel is now using TLS 1.3.
ISL Light - Desktop - Add "Open Monitors in Separate Windows" to Toolbar / Extend Monitor Selection (FEATURE) [ISLLIGHT-7535] More
Description
Added support for a fourth and fifth monitor button and a dedicated "Open Monitors in Separate Windows" button to the session toolbar. When there is not enough space in the toolbar, these buttons are available in the "more" dropdown.
ISL Light - Desktop - Show only selected metrics in debug panel (FEATURE) [ISLLIGHT-7546] More
Description
Added a filter input to the Histograms tab of the ISL Light debug panel. Typing a regular expression shows only metrics whose full name matches the expression, and the view updates live as you type. An empty or invalid expression continues to show all metrics.
ISL Light - Desktop - Post detailed user activity to icp (FEATURE) [ISLLIGHT-7558] More
Description
ISL Light now records detailed user activity - each session and program-wide feature use is timestamped and streamed to ISL Conference Proxy over a new events message. A single owner session is elected so program features are reported once across concurrent sessions, and per-message confirmation prevents already-acknowledged events from being resent.
ISL Light - Desktop - Missing support for --touch-pad cmdline (FEATURE) [ISLLIGHT-7561] More
Description
Added support for a numeric keypad in the Join Session window. The keypad can be shown or hidden through the menu option "Show Numeric Keypad" / "Hide Numeric Keypad" and can also be opened using the --touch-pad command line argument.
ISL Light - Desktop - Remove SAS library (FEATURE) [ISLLIGHT-7588] More
Description
ISL Light no longer uses the internal SAS library for sending Ctrl+Alt+Del to the remote computer. The system SAS API is now used instead.
ISL Light - Desktop - Prevent clipboard feedback loop (FEATURE) [ISLLIGHT-7589] More
Description
In previous versions, when clipboard sharing was active between the operator and the remote computer, clipboard updates could bounce back to their originator and cause repeated clipboard writes. Clipboard content now carries an origin identifier so that content looped back to the side that produced it is ignored.
ISL Light - Desktop - Allow generic clipboard transfers to run when desktop streaming is not active (FEATURE) [ISLLIGHT-7590] More
Description
Added support for clipboard transfers to continue working when desktop streaming is not active in ISL Light session.
ISL Light - Desktop - ISSC add support for generic clipboard (FEATURE) [ISLLIGHT-7594] More
Description
Added support for generic clipboard operations (such as CTRL+C and CTRL+V) between the operator and remote computer on Windows. In addition to text, users can now copy and paste images and files through the clipboard during a remote session. Large clipboard content is transferred lazily through a dedicated channel to avoid blocking the session.
ISL Light - Desktop - Use system uname call instead of starting new process (FEATURE) [ISLLIGHT-7595] More
Description
When querying OS information on Unix-based systems, ISL Light no longer starts a separate process to run the "uname" command. A direct system call is used instead, which is faster and more reliable.
ISL Light - Desktop - Add audit to generic clipboard file transfer (FEATURE) [ISLLIGHT-7596] More
Description
Generic clipboard file transfer now emits audit information so clipboard copy/paste activity between operator and client can be logged. Audit events include the item kind, name, path, size, direction (send or receive) and progress state (start, done or cancel when the transfer is aborted).
ISL Light - Desktop - MAC- CMD + Q will quit application without any confirmation (DEFECT) [ISLLIGHT-7101] More
Description
Users experienced an issue on macOS where pressing CMD + Q during an active session would immediately close ISL Light without a confirmation dialog. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Not all "Edit session" options are saved when saving with enter key (DEFECT) [ISLLIGHT-7107] More
Description
Users experienced an issue where not all "Edit session" options were saved when pressing the Enter key. The functionality was redesigned so that Enter only saves the changes when focus is on the Save button, and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Enabled setting "Play recording once it's finished" does not work if "Start recording when a session is started" setting is enabled (DEFECT) [ISLLIGHT-7138] More
Description
Users experienced an issue where the setting "Play recording once it's finished" did not work when the "Start recording when a session is started" setting was enabled. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - When connecting to remote computer using French language, connect button is too wide (DEFECT) [ISLLIGHT-7222] More
Description
Users experienced an issue where the connect button was too wide when connecting to a remote computer using French language. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Incorrect control status when remote control is disabled (DEFECT) [ISLLIGHT-7532] More
Description
Users experienced an issue where the status bar did not correctly show "Client has control" when the client joined a session without allowing remote control. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Incorrect font in ISL Light on Linux (DEFECT) [ISLLIGHT-7539] More
Description
Users experienced an issue where an incorrect font was used in ISL Light on Linux. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Talk section in ISL Light Settings does not show any device to choose from (DEFECT) [ISLLIGHT-7547] More
Description
Users experienced an issue where the Talk section in ISL Light Settings did not show any audio or video devices to choose from when no call was active, and the microphone and camera tests had no device to use. The functionality was redesigned so devices are enumerated when the talk plugin loads, and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - ISL Light session Input filed is not fully visible with Windows scale 125% (DEFECT) [ISLLIGHT-7550] More
Description
Users experienced an issue where the session input field was not fully visible when Windows display scaling was set to 125%. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - ISL File Manager time discrepancy (DEFECT) [ISLLIGHT-7554] More
Description
Users experienced an issue where the time shown in ISL File Manager was not displayed in the local time zone, which was confusing. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Allow failed connections during ssl startup (DEFECT) [ISLLIGHT-7556] More
Description
Users sometimes experienced rare connection failures during SSL/TLS session startup which could lead to resource leaks or a crash. Handling of failed connections during SSL/TLS startup was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Disable popup type management (DEFECT) [ISLLIGHT-7557] More
Description
Users experienced an issue with dropdown menus on the dashboard after the popup type change introduced in a previous version. The popup type management for the create (+) and hamburger menus on the dashboard was disabled, so the menus fall back to the default popup type.
The defect was fixed.
ISL Light - Desktop - Missing cmdline --on-connect "desktop?admin=restart" or not working (DEFECT) [ISLLIGHT-7560] More
Description
Users experienced an issue where the cmdline --on-connect "desktop?admin=restart" did not enable restart and resume in some cases, specifically when the client had ISSC daemon installed but did not have admin privileges. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Incorrect username or password text accessibility issue on macOS (DEFECT) [ISLLIGHT-7568] More
Description
Users experienced an issue on macOS where the "Incorrect username or password" text was not correctly read by accessibility software. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Password overlapping "show password" icon (DEFECT) [ISLLIGHT-7571] More
Description
Users experienced an issue where the password text overlapped the "show password" icon when the input became long. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Block Remote Input does not block multitouch gestures/touch (DEFECT) [ISLLIGHT-7574] More
Description
Users experienced an issue where the Block Remote Input feature did not block multitouch gestures and touch/pen events on the remote computer. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Mandatory password change results in "No data from API" (DEFECT) [ISLLIGHT-7576] More
Description
Users experienced an issue where a mandatory password change resulted in a "No data from API" error. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Hide Stream remote sound when connected to macOS (DEFECT) [ISLLIGHT-7577] More
Description
Users experienced an issue where the Stream/Request Remote Sound option was shown in the tools menu when connected to a macOS or Linux computer, even though remote sound streaming is not supported on those platforms. The functionality was redesigned and the option is now hidden when connected to unsupported platforms.
The defect was fixed.
ISL Light - Desktop - Allow transferring more than 1 pdo object (DEFECT) [ISLLIGHT-7591] More
Description
Users experienced an issue where transferring more than one PDO object via clipboard on Windows did not work correctly. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Fix timeout on reading of PDO (DEFECT) [ISLLIGHT-7592] More
Description
Users sometimes experienced an issue where clipboard transfers of larger content would fail due to a too short timeout when reading clipboard data. The timeout was increased and the read chunk size was raised, so the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Fix v3 desktop plugin startup (DEFECT) [ISLLIGHT-7593] More
Description
Users experienced an issue where the desktop plugin failed to start correctly when connecting to older versions of ISL Light. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Restart clipboard proxy on crash (DEFECT) [ISLLIGHT-7600] More
Description
Users experienced an issue on Windows where the generic clipboard and remote control stopped working when the remote computer was at the logon screen, after the remote user logged out, or when the clipboard process crashed - and copying content in that state could leave the operator's mouse and keyboard input paused. The clipboard component is now supervised and restarted automatically (shortly after a crash, and once a user logs back in), and pending clipboard operations are always acknowledged so operator input never stays blocked.
The defect was fixed.
ISL Player - Desktop - ISL Libs - Build MbedTLS 4.1 (SECURITY) [ISLPLAYER-349] More
Description
Internal mbedTLS library was updated to version 4.1.0.
ISL Player - Desktop - Migrate code http://*r301 links to https://*r301 AKA safe help page urls (FEATURE) [ISLPLAYER-337] More
Description
Help and informational links opened from ISL Player now use HTTPS instead of HTTP.
ISL Player - Desktop - Use PDQ Hancock service for signing executable (FEATURE) [ISLPLAYER-342] More
Description
Executables are now signed using the PDQ Hancock signing service.
ISL Player - Desktop - Replace QtVNC with ISSC (DEFECT) [ISLPLAYER-307] More
Description
ISL Player no longer uses the QtVNC component for playback and now relies on the internal ISSC streaming code instead.
ISL Player - Desktop - Migrate from QT 5 to Qt 6 (DEFECT) [ISLPLAYER-312] More
Description
ISL Player was migrated from Qt 5.15 to Qt 6.4.
ISL Player - Desktop - Icons from ISL Groop meetings are not displayed on the recording (DEFECT) [ISLPLAYER-330] More
Description
Fixed an issue where participant icons from ISL Groop meetings were not displayed in the recording playback.
ISL Player - Desktop - Installation of ISL Player fails on macOS if it's first installation due to missing /etc/islonline folder (DEFECT) [ISLPLAYER-331] More
Description
ISL Player application failed on macOS in case it was the first install of the application. The issue was that installer had a check which expected the folder /etc/islonline to exist, but it's created later in the installation process. The checker which checked if folder exists is now ignored and installation now works correctly.
The defect was fixed.
ISL Player - Desktop - Move from Qt 6.4 to 6.10 (DEFECT) [ISLPLAYER-333] More
Description
ISL Player was updated to use Qt 6.10.
ISL Player - Desktop - Disable dark mode on Windows (DEFECT) [ISLPLAYER-334] More
Description
Dark mode is now disabled in ISL Player on Windows; the application uses the light theme even when Windows is set to dark mode.
ISL Player - Desktop - AutoTransport send correct SNI with IP hint (DEFECT) [ISLPLAYER-338] More
Description
AutoTransport https-direct and wsstun-direct will send correct hostname SNI when using IP hint. httpt-direct and wstun-direct will set correct hostname in Host header instead of IP hint.
The defect was fixed.
ISL Player - Desktop - Fix flags dialog on QT 6.0 (DEFECT) [ISLPLAYER-339] More
Description
The style of window where you can control which flags ( functionalities ) are enabled was having an outdated look. The windows style was adjusted to the modern window.
The defect was fixed.
ISL Player - Desktop - Make QT 6.10 work on first Windows 10 (DEFECT) [ISLPLAYER-341] More
Description
Users experienced an issue in previous version where they were not able to install ISL Player on Windows 10 version 1803 (Build 17134) or older. We have redesigned the functionality and users on any Windows 10 version are able to install ISL Player now.
The defect was fixed.
ISL Player - Desktop - Export on maximum resolution fails (DEFECT) [ISLPLAYER-346] More
Description
Exporting a recording at maximum resolution could fail because required keyframe data was not available.
The defect was fixed.
ISL Player - Desktop - Pop out window does not work correctly (DEFECT) [ISLPLAYER-347] More
Description
Users experienced an issue where popping out a window in ISL Player did not behave correctly.
The defect was fixed.
ISL Player - Desktop - Raise os_version version of ISL programs to osx 14 (SPECIAL) [ISLPLAYER-335] More
Description
Minimum operating system requirement for ISL Player on macOS was raised to macOS 14.
ISL Player - Desktop - Raise minimal OS requirement for InnoSetup (SPECIAL) [ISLPLAYER-336] More
Description
The minimum supported Windows version for the installer was raised to Windows 10.
ISL Player - Desktop - Raise minimal OS requirement on Windows from Windows 7 to Windows 10 (SPECIAL) [ISLPLAYER-340] More
Description
Minimal operating system requirement on Windows for ISL Player application was raised from Windows 7 to Windows 10.
ISL Pronto - Desktop - Build MbedTLS 4.1 (SECURITY) [ISLPRONTO-1437] More
Description
Internal mbedTLS library was updated to version 4.1.0.
ISL Pronto - Desktop - Custom time range always displays 1 day (DEFECT) [ISLPRONTO-1435] More
Description
When viewing chat history with a custom time range, the displayed range label incorrectly showed the end date on both sides instead of the selected start and end dates.
The defect was fixed.
ISL Pronto - Desktop - Poor visibility in clients section due to background and text color combination (DEFECT) [ISLPRONTO-1436] More
Description
In the clients list, the selected item's text was hard to read due to the background and text color combination. Text and highlight colors for hovered and selected clients have been adjusted for better readability.
The defect was fixed.