Same issue here too. Poor timing as I just started playing again. Hopefully fixed soon!

Yeah, after the update kept failing I had GOG Galaxy uninstall and reinstall, and the game does get fully installed despite Galaxy continuing to spit out an Installation failed message at the very end. The game does indeed run fine if you use the .exe file directly.

Hopefully the Galaxy issue gets sorted soon.

Same. No access to disk or some error.

Oh thank god its not only me, I thought I was going crazy, I keep trying to reinstall this.
I'll just uninstall it for now, they better fix this.

Same problem here- and manual install fails as well.

Looks like they pulled the problem patch. You should be able to install/reinstall, now.

Thanks! Trying.

update: will inform whether the attempt is successful

update #2: it worked!

The game uninstalled on its on. I didn't uninstall it. So they can remotely uninstall my game?

Well, it de-installed or some error made it forget to where to look, or something got corrupted. Re-installed seemed to fix.