I tried everything, from renaming the exes to renaming Launc Grim Dawn shortcut, but I just can't make Galaxy recognize the Grim Internals mod. It doesn't update the cloud files nor it registers my game time. How can I do it?

I'm sure there's a way to do this with Galaxy but I just run the game and GI without Galaxy.

Fpr me it works just fine. Well ofcourse we have to wait for the Grim Internals update. But with Galaxy it works. Start GI first or just start the game within the launcher... then when you are in the game open grim internals. works perfectly fine for me that is.

I have other solution to this. All You have to do is install Griminternals as normal and then You have to edit 2 files.

First one is a shortcut called "Launch Grim Dawn", RMB, properties, change target from

...GOG Galaxy\Games\Grim Dawn\x64\Grim Dawn.exe

to

...GOG Galaxy\Games\Grim Dawn\x64\GrimInternals64.exe"

Second is goggame-1449651388.info, edit it with text editor and replace line

"path": "x64/Grim Dawn.exe"

with

"path": "x64/griminternals64.exe"

Restart Galaxy, should work, but not right now 'cause Griminternals hasn't been updated.

Sad thing is You will have to repeat the whole process every time Grim Dawn updates...

Just start Grim Dawn via Galaxy Launcher. When you're on the menu screen (where you see your chars), start Grim Internals, that's it.

Latest Update for HF3 is available:
https://www.grimdawn.com/forums/showthread.php?t=53629