Accessibility access is checked, but all still shows it's not

I have UI Browser 3, but then I saw that UI Browser 4 was available as open source and downloaded it. Since I’m not an expert, I think v4 requires more than just the installation (or maybe I’m missing something).

Thing is, v4 is not working on my computer so I wanted to install v3 again.
I removed all files related to UI Browser using Easy Find and when I install v3, I get this warning that accessibility needs to be accessed by UI Browser, which I authorize, but no matter what, that warning doesn’t go away, making the app not work at all.

I tried logging out. No luck
I tried removing the app from the Accessibility pane completely and adding it manually and allowing it, no luck
Any tips?