I installed all of them through the app. They just don't work most of the time, which is the problem. Manually downloading and running them is *the only way to make them work*.
As for the error, here - note that this is a game currently installed through the itch client on my computer. This is one I have already gone through the process of adding manually to my account to download through the client to continue to not be able to play without going and manually running it.
This is ludicrous, the way y'all have structured all of this.