Arrrr my fellow pirates, I wanted to install Starfield, but I seriously don't know how. I already downloaded a .rar file, but I don't know what else to do with it. I run Arch Linux.
In the case of Linux I strongly recommend that you never use installers or repacks, which usually have a high probability of failure with Wine in my experience.
I can't confirm right now because I haven't downloaded Starfield yet, but try to only use portable versions of games, like the ones Steamrip offers, where you just download a .zip and you're all set, just run the .exe in Wine and play as if it were Windows.
Although Starfield is currently not available on Steamrip, you can find a portable version of Starfield on Rutracker.
The only problem I have encountered using installers/repacks with Lutris is that they sometimes can't create the installation folder. Creating it manually in the .wine folder is the only workaround I have found.
Then I run the installer .exe with Wine. Once that finishes I add it as a non-steam game and select the newest version of Proton. Sometimes I'll check protondb if the game doesn't work right away.