If I have a game open in the itch.io app browser. Then bring up the 'Manage Game' Pop up. Then click the 'Manage' button next to the currently installed item. Then the pop-up just disappears and nothing happens.

This is on Windows 10

I am also seeing this issue.

Could you tell me which game you’re having this issue with. I did some testing on my own installed games and haven’t been able to find any examples that don’t work.

It seems to be any game.

But I just confirmed it with https://johanpeitz.itch.io/picocad2 and https://hempuli.itch.io/a-solitaire-mystery