(Note: a subsequent Steam Client update was done October 7 to fix some additional issues)

General
When Steam detects a game file has been corrupted, it will now try to reuse as much of the corrupted file as possible to save bandwidth when downloading correct data for that file
Fix bug causing slow reconnect to Steam after resuming from a system suspend
Remote Play
Automatically install the audio drivers on Windows when streaming starts if needed, pass -skipstreamingdrivers on the command line to disable them
Pipewire desktop capture available on Linux, launch Steam with the -pipewire command line option to enable
Fixed Linux games seeing multiple controllers when Steam controller configuration support is enabled
Fixed Linux clients not getting any controller input once streaming starts
Fixed using multiple PS5 controllers connected via the Steam Link app
Fixed black screen with PipeWire capture under KDE plasma
Steam Cloud
Fix infinite retry loop for failed background file downloads
Increased the allowed upload time to enable transferring large save game files for users who have limited upload bandwidth
Automatically sync Cloud files for installed games at startup
Fix issue causing extra work on reconnect to Steam
Linux
Reduced sizes of Vulkan pre-caching datasets by splitting and versioning them according to Proton versions and graphics driver capabilities. As a result, the datasets will start from scratch after updating.
Fix checking for execute privileges when picking a Steam Library folder location
macOS
Add OS support for macOS 12 “Monterey”
Fix browser user agent causing some web sites to misidentify Steam Overlay web browser,(Note: a subsequent Steam Client update was done October 7 to fix some additional issues) General When Steam detects a game file has been corrupted, it will now try to reuse as much of the corrupted file as possible to save bandwidth when downloading correct data for that file Fix bug causing slow reconnect to Steam after resuming from a system suspendRemote Play Automatically install the audio drivers on Windows when streaming starts if needed, pass -skipstreamingdrivers on the command line to disable them Pipewire desktop capture available on Linux, launch Steam with the -pipewire command line option to enable Fixed Linux games seeing multiple controllers when Steam controller configuration support is enabled Fixed Linux clients not getting any controller input once streaming starts Fixed using multiple PS5 controllers connected via the Steam Link app Fixed black screen with PipeWire capture under KDE plasmaSteam Cloud Fix infinite retry loop for failed background file downloads Increased the allowed upload time to enable transferring large save game files for users who have limited upload bandwidth Automatically sync Cloud files for installed games at startup Fix issue causing extra work on reconnect to SteamLinux Reduced sizes of Vulkan pre-caching datasets by splitting and versioning them according to Proton versions and graphics driver capabilities. As a result, the datasets will start from scratch after updating. Fix checking for execute privileges when picking a Steam Library folder locationmacOS Add OS support for macOS 12 “Monterey” Fix browser user agent causing some web sites to misidentify Steam Overlay web browserRead More