Hi everyone. I want to let you know that Steam support has helped us get to the bottom of the issue with content distribution on macOS that was leaving many users with nothing more than an "EmptySteamDepot" file.
The problem was, unfortunately, due to a Steamworks configuration mistake that I made in which the macOS depot was not properly attached to all of the various packages--this is also the reason why we weren't able to reproduce the issue on our end, because the developer testing package was not affected by the problem. Long story short, I've applied Valve's suggested correction and that should hopefully fix the problem for everybody, forever.
Again, I want to apologize to everybody who has been affected by this issue. Your support means a lot to the team, and I know how frustrating and annoying this has been. I'm sorry that I wasn't able to solve this faster, or better yet avoid it entirely, but I'm only human.
If you have experienced issues with running Krita on macOS, please validate your files (or reinstall) and try again, and let me know if the issue has been fixed on your end.
Sorry all.
Emmet