Can we please have a solution for the forced 2.0 update?

I have a mac that runs el capitan. It cannot be further updated.

The gog galaxy 2.0 client only runs on a newer version. However if you install an older version (say 1.2.x) the app "self updates" at first launch with no options or prompt to galaxy 2.0 : which of course is not compatible with my mac...

Is there a fix? I cant find it, and have tried maybe a half dozen galaxy1.x apps. They all self update instantly.