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When I try to download the offline installer for this, first it defaults to the MAC installer and I'm running Windows. This is the only game page that does that . Not a big deal, I just change it to Windows in the drop down and it shows an .exe file BUT when you try to install from that file it tries to download and install GOG Galaxy which I do not use.

I live in a really remote area with terrible internet access so I usually download my offline game installers at a relatives house that has good internet then take them home and install them offline. If this installer forces GOG Galaxy to be installed and you try to run it when you're offline, how can I install the game?
Just below that, there's a little toggle arrow. Bap that. Reads, "Offline Backup Game Installer."