For years, the game existed on version 1.26. It was stable, balanced, and the standard for competitive play (especially in regions like China). However, in 2019, Blizzard released patches leading up to version to prepare the infrastructure for the upcoming Reforged remaster.

Patch 1.31 was a major update that introduced the “Reforged” game data structure (CASC instead of MPQs), LUA scripting, and broke many classic mods. Repacking 1.31 is different from older versions.