If you are looking for PC patches rather than PS3 PKGs, these are the latest official versions: GTA IV (Standard) Patch 8 (v1.0.8.0). GTA IV (Complete Edition) v1.2.0.59 (Latest Steam/Rockstar Launcher version). Steam Community for the Definitive Edition patch or installation steps for a PS3 PKG? Guide :: Common issues after the HUGE Update (1.2.0.59)
GTA IV stores shader caches that conflict with patched versions. gta iv pkg patched