Rockstar have patched Grand Theft Auto IV for PC ahead of the release of Episodes from Liberty City this Friday.

Notable modifications include the removal of the separate Rockstar Games Social Club application and various graphical optimisations.

You can download this patch from GP Downloads (104MB). Full changelog is as follows;

Rockstar Games Social Club
- Remove Rockstar Games Social Club application
- Separate RGSC application no longer required to launch game
- Social Club login now occurs during the launch process Shadows
- A new, less memory-intensive, and better-looking scalable shadow solution has been implemented
- Enhanced Night Shadows added with user-selectable level of detail (replaces Shadow Density)

Performance
- Rendering optimizations have been made to improve performance, particularly when enabling shadows
- User-configurable graphics settings have been added for shadow control
- Improved memory management Multiplayer -Enhanced security to isolate users from cheaters and hackers Episodic Content
- Provide in-game support to purchase "The Lost and Damned" and "The Ballad of Gay Tony" (Not available in Russian/Japanese Versions)

Bug Fixes
- Vehicle shadows re-enabled between 8pm and 6am
- Fix floating street textures
- Pedestrians in vehicles appear further out from the player to allow for long range sniping
- The Moon has been implemented with simulated lunar phases
- Fixed garbled text in Japanese Multiplayer menus
- "RESC 10" error fix for specific hardware configurations