Steam library imported successfully but all games marked as "not installed".
When I click "install" button it shows popup "launching steam game" but nothing happens.
Other library's games launches just fine.

I do experience the same issue.
The installation process can be started via Galaxy 2.0 but games do not appear as installed in 2.0 and can not be launched

I have the same problem since the update Galaxy 2.0 update downloaded today, all was working fine yesterday.

Since latest update only two Steam games I have installed are detected as installed. The rest I have the same issue as you, install button + launching message without launching game.

same here, i thought it was because Gog G2.0 couldnt recognise a second install folder than the main. I hope the next update fix it.

Apparently it's not that. The two games detected as installed are on D, RL is there too but gives an install button.

Hi,

Same here, only one game is detected, it's the one in my C disk, all the others are in D disk.

Worked yesterday, so the last update did this.

Same here, but I believe I know the reason in my case.

Recently, I made a new installation of Windows 10 on my SSD (c :). I keep all my games on the HDD (d :), so after the new installation of windows and the launchers, I was pointing one by one (Steam, Origin, battle.net, etc) for disk D.

Steam recognized all my library that was in D, but for Windows none of these games are REALLY installed, so for the Galaxy GOG they are not installed either.

The Origin and Battle.net games have been "reinstalled" for Windows during the library rescan process, so they appear in the Wndows control panel, but Steam games appear as installed only inside Steam...

I do not know what to do.

:(

Ok, I managed to fix the Steam issue for me.

You will need to update the steam integration components manually. To do that completely close GOG Galaxy.

Download v0.29.1 from here: https://github.com/FriendsOfGalaxy/galaxy-integration-steam/releases

Next, you need to copy those files into Galaxys plugin folder which is located as follows:

C:\Users\Your Name\AppData\Local\GOG.com\Galaxy\plugins\installed

Replace all the files inside the steam_ca folder with the downloaded ones - restart GOG Galaxy 2.0

It should automatically detect your steam games now.

Cool, it worked! I had to go into options and click on retry for Steam (as it had fail to load) but all seems fine now. Thanks!

Didn't work for me sadly.

Was away for e few days. Launched GOG client today and all steam games are successfully recognized as installed. Tried starting a few of them and there were no problems.
Guess there was an update with a fix in past few days.

I don't know what I am doing wrong but this won't work for me. I download the file and replaced all of the contents in the steam cs folder (using the newest version and the v0.29.1) and non of them worked.

Edit: reinstalling steam fixed it

Edit 2: It broke again still don't know how to fix it