I'm having too this and other issues since the last updates. For now can't launch it, and, it's not running any processes.

EDIT: Deleting the lock file worked. There was some component missing yesterday, but it launched anyway. The last updates seems not so stable for me here.

Thank you for writing your post in human speak.

This has happened to me three times now. Gog - what the heck?

Same problem here. The solution to delete the file in lock-files worked.
I wondering thats gog not react with a fix ore update. Seems to be a blocker-feature for gog games and not everybody looks in this forum maybe...

I have same problem anyone can help us?

The solution has been posted in this thread already.

GOG should fix the client though, so we wouldn't have to keep doing this.

It's happened to me often enough that I wrote up a little batch script to delete the file with a click.

You know a program has issues when it's worth bothering with that.

Seriously, GOG, fix this. It's not funny.

Super helpful, thanks!

This worked well for me, thank you! Such an odd 'error' with the software.

this is bad, why gog does not care about us users? so may complains and still nothing done

Thank you so much for wording this in a way i understood how to find the program data. this helped a lot.

I am having exactly the same problem and can't launch GOG Galaxy because of that. For me the mentioned fix does not work.

When I delete the file
C:\ProgramData\GOG.com\Galaxy\lock-files\GalaxyClient.exe.lock
or even the whole folder
C:\ProgramData\GOG.com\Galaxy\lock-files

The lock file is simply recreated when I try to launch the client.
Of course, I've also reinstalled GOG Galaxy and restarted my PC a couple of times, but this didn't fix the problem.

Yes, I am getting this message when I try to start the client. Then I delete the file "GalaxyClient.exe.lock" and try to start GOG Galaxy again - the error message appears again and I cannot use the client.

Edit: Success! I went through all subfolders in "C:\ProgramData\GOG.com\" and while doing so, Windows Explorer told me for a few subfolders, that I don't have sufficient permission to open that folder and I need to confirm this message. After doing so, I could open these folders - and I could also launch the Galaxy Client after that.