Hi Igor, this is Kimberly, an independent advisor, I'm glad to assist you today.
A surprising culprit is OneDrive, especially if your Rockstar files are synced there:
Many users report the launcher loads normally once OneDrive is open and syncing, because game data is stored under OneDrive\Documents\Rockstar Games. If OneDrive isn't active, the launcher hangs trying to access those files.
One user shared:
“Make sure OneDrive is running… the save game data folder is located at %USERPROFILE%\OneDrive\Documents\Rockstar Games… If OneDrive isn't running…, the Rockstar Games Launcher will appear stuck…”
Sign into OneDrive, let it sync fully, and pin or set the Rockstar folder to “Always keep on this device.”
Should you have questions, please let me know.
Best regards,
Kimberly