Posted November 04, 2017
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Installed Galaxy, deactivated all features where possible.
Had to sign in, import the game and update.
Uninstall Galaxy.
Clean user profile: in c:\users\<username>\appdata from all "GOG" and/or "Galaxy" folders.
Delete the "GOG Galaxy" folder from C:\Program Files (x86)\.
The Desktop shortcut will not work any more without Galaxy, but the "Launch Elex" from the game installation folder still starts the game now.
This means the C:\GOG Games\Elex\ELEX.exe that Galaxy installed, does not work without Galaxy.
But the original C:\GOG Games\Elex\system\ELEX.exe works, you just need to update the shortcut on the desktop.