I can provide the exact steps or needed to get you back into Liberty City.
In older versions of the game, LaunchGTAIV.exe was the primary file used to bypass the Rockstar Social Club login window or to initiate the game through Steam. In the newer , the file structure has changed, and the game typically launches via GTAIV.exe . How to Fix Launch Issues download launch gta iv exe link
The direct source from the developer.