So... Today installed the game BLACKHOLE wich I want to play for some time, bought it on the Black Friday sale.

As usual. I use off line installers , not Galaxy. Although I still have a old version of GOG Galaxy 2.0 that did try when first receive the invite to the closed beta and never deleted.

First launch of the game after installing did open Galaxy by itself, wich I assume was a misinput of some kind by me(like some missed checkbox, TBF wasn´t paying attention to the installation proces)). To be sure, did a fresh game install and well, there is that Galaxy thing again...

Anyone have a similar experience?

Edit: Crap, this is on the game page: "Please Note: Challenge Vault DLC requires the GOG Galaxy client to play and is supported only on Windows and OSX operating systems."

If the installer detects that Galaxy is installed it will create a shortcut that will start Galaxy and then the game. But it's only the shortcut, if you go in the game folder and directly double click on the EXE it will start normally without launching Galaxy. You can also change the shortcut to launch the exe directly.

OP solved it themselves.

Clever boy.

Thanks. Kinda freak me out.
No game ever did it before...
Why would a stand alone installer look for Galaxy is beyond me (it has to search through files or registry entries I guess).

Anyway, after deleting Galaxy and re-install the game, some random error was preventing launch, "MSVCR110.dll" was missing wich of course, was 2012 Visual Studio x86 libraries missing.

Because GOG desperately WANTS you to use Galaxy and they will do everything they can get away with to push it. Which means everything apart from making it officially mandatory (which would be DRM).

Offline installers contain required components of galaxy regardless of wether you use it or not:
https://www.gog.com/forum/general/gog_galaxy_required_in_certain_games

So that peoples have the same "experience" no matter how they install the games. They consider that if peoples have Galaxy installed it means they are interested into using Galaxy. Anyway the fix is easy you just can change the shortcut to point directly to the exe or, if if you don't care about Galaxy, do like you did and uninstall it.

If you have Galaxy installed, pressing the Launch button on the installer will launch Galaxy which will launch the game for you. Now I've no idea if this carries on for the shortcuts themselves, but you are able to make shortcuts that will launch Galaxy which will itself launch the game. I assume the intention is that since you have Galaxy, you would want to use it whether you are downloading the games from itself or from offline installers.

I don't see why the DLC would require Galaxy though. It's a single player game by the storefront's admission. Is the Challenge Vault basically some DLC that hooks the game up with Galaxy features, or is it more than that?

It probably has online features that require Galaxy.

I do use Launchbox to keep the games in one place, so Galaxy 2.0 is not a bad idea. However it seems to lack basic functions.

I've been following a few threads an I'm aware some games use Galaxy for multiplayer and others, well, let's say GOG pulled a Steam. But a small, single player game from a indie dev, usually is pretty straight foward, so I thought.
The game use Galaxy to upload and compare best times, that's what challange vault is all about (wich of course don't care).
About the game itself, it makes me feel dumb AF...

Just a small disclaimer: I do care about DRM but Privacy is much important in this day and age. Extrapolate what happened to DRM in the last 20 years, to what will happen to Privacy in the future...