Why would you replace my working Galaxy 1.0 with a 2.0 BETA that doesn't even work properly? I had to download an offline installer.

Also, I had Galaxy auto updates disabled. You used to be better than this GOG. I 'm going to reinstall Galaxy 1.0 and disable auto updates one more time.

If you're having any trouble, this link might help:
https://www.gog.com/forum/general_beta_gog_galaxy_2.0/how_to_keep_galaxy_v12_client_and_avoid_the_forced_v20_beta_update

And if you're contacting support, fair warning, there's a "4 week" wait time on support responses right now, which apparently includes MARCH as being less than 4 weeks ago.

Make sure that you delete the updater files so that Galaxy 1 can't update even if it wanted to. If you did everything correctly, after a few hours you should get a blue bar with a "Your GOG Galaxy couldn't update to the newest version" error at the bottom of your library page.