Rockstar Games have patched GTA IV with another maintenance patch 22.214.171.124 on PC, this patch is just small bug fixing update that is probably making the game ready for the upcoming large update.
The GTA IV patch 126.96.36.199 can either be downloaded and installed manually or let the Games for Windows live do it for you, when you login to Games For Windows Live it will automatically install it for you.
Patch 188.8.131.52 simply adjust your resource management system and now it will detect it based on the settings of your operating system. Download the patch using the download link provided below.
GTA IV Patch 184.108.40.206 Download.