The GOG launcher is optional (I don’t use it). On their website you can download offline installers for every game you own, and these installers don’t require the GOG launcher or any account authentication.
@festus where is this offline installer, exactly? Link? I just get hit with the gog new launcher option being advertised on the site.
https://support.gog.com/hc/en-us/articles/213148105-How-do-I-download-my-purchased-items-?product=gog has as the second option how to download the offline installers.
@festus nice. So what’s the point of the gog launcher app after this? Anyways, I prefer to use heroic. Much lighter and easier.