When launching FAF, the launcher gives an error

When launching the launcher, this window constantly appears

Uninstall, manually delete the relating files from C:\Program Files, reinstall.

Your update failed for some reason and you have a mix of old and new files. This happens a lot.

I have already deleted absolutely all the files I could find

I see it is installed to D:\FAF-Client and not C:\Program Files

make sure to delete the whole faf-client folder after uninstall

I deleted game files from everywhere by searching for them. Is there some kind of uninstaller for the client?