What is going on? I am very upset about GOG. They say GOG Galaxy will always remain optional.
And now GOG begins to include that 300 MB Galaxy thing in every "STAND-ALONE"-installer.

Noooo! I hate GOG for that decision.

If I want to download 10 games of my library, I have to download 10 times that Galaxy crap?
Waste of download volume, waste of download time, waste of disk space for backup....

Click on your game, click more then click classic installers for GOG Galaxy free installers.

Some games will not remember your settiings on this (ie The Witcher 3) and you will need to do this for each game.

You can download the Classic installers that don't contain Galaxy instead. Just go to the gamecard in your library, click on more and choose classic installers.

And yes, I'm also very disappointed that GOG still don't give us the possibility to choose the classic installers as a default setting (and also that they hide them very well).

OK, Thanks! I am happy that I can download the clean installers furthermore...

Since you obviously use the web site and not Galaxy I'd also recommend for you to install the adalia fundamentals script which you can find here.

With it you can set classic installers as default option, a feature GOG has promised to do themselves months ago but unfortunately did not implement yet.