62
Lutris Login Requirement for GOG Game Ownership Verification
(iusearchlinux.fyi)
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.
Use the Lutris website to find the game and install script, that should bypass the login check and let you bring your own exe.