The inclusion of "2021" in the search query is crucial. While error 12059 has existed since 2008, the year 2021 marked a seismic shift for GTA IV on PC.
Released as part of the transition to the , version 1.2.0.59 replaced the aging Games for Windows Live (GFWL) system. While it simplified some aspects of the game, it introduced new loading issues and compatibility problems with older mods like ENB. Essential Fixes for Version 1.2.0.59 gta iv 12059 2021