Download GOG Galaxy from the GOG website. Install it with Crossover. (Make sure Crossover installs the necessary dependencies for GOG Galaxy).
Go to your GOG.com account and choose any Windows game.
Choose "Download and Install Now" (important: Do not choose the offline backup game installer).
Move the resultant file into the C: Drive for the GOG Galaxy bottle you created earlier.
Double-click that file to open it. The first time you do, it will download whatever game you chose. After that, it will just open Galaxy, and you can use it normally.
Viola! A perfectly functional GOG Galaxy.
System: macOS 10.13.6, Crossover 17.5.1, Galaxy for Windows 1.2.45.61.
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