Grand Theft Auto IV Update Released
Product Update - Valve
Updates to Grand Theft Auto IV have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
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"
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
RESC 10" error fix for specific hardware configurations