Lutris Login Requirement for GOG Game Ownership Verification
As the title suggests, Lutris is requiring me to sign in to GOG so that it can verify my ownership of the game. If my memory serves me well, I used to be able to simply click on the GOG version and then link it to the installation executable file that I downloaded from gog-games.com.
This was fixed already, but a new release of Lutris has not been published with the fix included. The exact line in your screenshot was specifically removed in this commit:
I tried lutris, heroic, bottles... even steam has issues with dodi's or FG installers. Now I just do wine path/to/file to install and add .exe as a non-steam game to run it through proton and it works every time.
Personally I use innoextract on the installer, add the game to bottles or even steam library if I add it to my deck and play. No need to even bother double clicking installers, it's doing the same process of extraction with dumb banners I don't care about.