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nciceman: I had a lot of weirdness with this, so let me list ALL the steps that finally got it working for me:

1. Completely close GOG Galaxy 2.0 if it is running. This means make sure it is not in the taskbar either. Do this by clicking on the gear icon in the upper left of the GOG galaxy windows and selecting exit.

2. Go in to your %LOCALAPPDATA%\GOG.com\Galaxy\plugins\installed\ folder and remove any existing Rockstar plugin.

3. Start then fully exit the GOG Galaxy 2.0 client again. This insures the client has forgotten all about Rockstar.

4. Restart GOG Galaxy 2.0. Click the gear icon in the upper left and go in to settings. Confirm there is no Rockstar plugin entry.

5. Go into the Search GitHub field and type 'Rockstar'. Install the plug-in.

6. Once installed, attempt to connect. I checked the Accept Cookies box to be safe. Go through the login process. This will fail at a black screen; this is expected. Close the login window then completely exit GOG Galaxy again.

7. Go to your %LOCALAPPDATA%\GOG.com\Galaxy\plugins\installed\ folder and then go in the Rockstar plugin folder and edit the config.py file. Find the line that begins with "start_uri" (that's with an i, not an l). At the end of that line, inside the ending quotes, add the text "&returnUrl=/" (this time it is url and not uri). Save your changes.

8. Restart GOG Galaxy and attempt to connect. This time, after a brief pause with a black window, it should work.
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euro3er: Hi there. I wanted to say thank you for writing these steps. This fixed the login problem for me that I was having for months, which caused me to give up on having the Rockstar launcher integrated with GOG.
Can confirm this works but I did not uninstall the plugin as upon logging in, it would just stay as a blank login screen. Restarting GOG and going to settings would show that the plugin was installed but not connected. I did not have a config.py file but I had a consts.py file which had the "start_uri" in AUTH_PARAMS array. Saved and relaunched GOG and logged in without issue and shows connected.

Thanks
At first, I couldn't even download the plugin (yesterday) but today it works.
Post edited November 22, 2022 by Dave_Nosdivad
After adding the "&returnUrl=/" it did fix the black log-in screen BUT it is not importing any new games I bought.

Does anyone know any fix for this?
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Dave_Nosdivad: After adding the "&returnUrl=/" it did fix the black log-in screen BUT it is not importing any new games I bought.

Does anyone know any fix for this?
Unfortunately Rockstar are not very "integration friendly". One of the last updates to their launcher completely broke the integration compatibility.

The creator of the integration is aware of the issue, however it looks like the integration will have to be completely rebuilt if it can be made compatible at all. No estimate as of yet if and when the integration will work again.

https://github.com/tylerbrawl/Galaxy-Plugin-Rockstar/issues/160#issuecomment-1156521442
The fix doesn't work anymore