Have contacted Steam support will et you all know if I hear anything

It seems that the Steam installer is not setting up its environment properly. I was able to get this working by creating a few symlinks to the Chromium Embedded Framework where steam expects it to exist.

Details are here https://www.reddit.com/r/macgaming/comments/1n1xfsl/comment/ndkzu7t/

Hopefully this is something steam can sort out with their installer.

oh thank god it’s not just me, i thought I was going insane. I sent a message to steam support and everything.

Hi, thank you all for the reports detailing this issue. This was a regression in the Steam client public update that was released yesterday that primarily affected new installs of Steam. This should now be fixed.

Restarting the Steam client should cause it to download and install the new update. If not, launching, force-quitting the Steam app, then starting it again should force an update check.

Alternatively steps to remove and reinstall the client can be found here.

Yup. works perfectly fine now :)

If it doesn't respond when opened, click the file located at /Applications/Steam.app/Contents/MacOS/steam.sh. Then you'll be able to use Steam.

For me, nothing has changed, it’s still not working.

Ursprungligen skrivet av Ksofar:

For me, nothing has changed, it’s still not working.

Uninstall the app and reinstall it, that's what worked for me

It worked for me as well! Thank you!!
(M3 Macbook Pro)
I uninstalled steam and deleted the folder named 'Steam' in Library/Application Support before installing the latest version

zsh: killed /Applications/Steam.app/Contents/MacOS/steam_osx

Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

[Process completed]

Ursprungligen skrivet av mikela:

Hi, thank you all for the reports detailing this issue. This was a regression in the Steam client public update that was released yesterday that primarily affected new installs of Steam. This should now be fixed.

Restarting the Steam client should cause it to download and install the new update. If not, launching, force-quitting the Steam app, then starting it again should force an update check.

Alternatively steps to remove and reinstall the client can be found here.

didn't help

Still doesn't work.

Agent pid 12846
/Applications/Steam.app/Contents/MacOS/steam_osx ; exit;
user@removed -1266 ~ % /Applications/Steam.app/Contents/MacOS/steam_osx ; exit;
src/vstdlib/osversion.cpp (393) : Assertion Failed: Unsupported macOS version 26.0.1
src/vstdlib/osversion.cpp (393) : Assertion Failed: Unsupported macOS version 26.0.1
src/steamexe/steamglobalinstance.cpp (389) : m_NamedPipe >= 0
src/steamexe/steamglobalinstance.cpp (389) : m_NamedPipe >= 0
[2025-10-13 16:14:54] Startup - updater built Mar 15 2022 17:15:24
zsh: terminated /Applications/Steam.app/Contents/MacOS/steam_osx

Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

[Process completed]