The keyword refers to a specific historical update and "crack" release for the PC version of Grand Theft Auto V (GTA V), released in early 2015 by the Chinese piracy group 3DM.
[PC] Grand Theft Auto V Update 5 (v1.0.350.2) and Crack v4 – 3DM The latest update for Grand Theft Auto V 3DMGAME-Grand.Theft.Auto.V.Update.5-v1.0.350.2-...
: Fixes for major bugs like the "failed ZLIB call" which often requires verifying game integrity : Periodic login bonuses, such as the free $1,000,000 in-game currency installation help for a specific mod, or are you trying to fix a startup error with this particular version? "3DMGAME-Grand
This is the specific game version number that results from applying Update 5. For reference, this version was released by Rockstar Games in late 2015. It primarily addressed issues related to the game’s online heists, stability fixes, and various crash bugs. (Notably, this version predates the major "Ill-Gotten Gains" content updates and the later next-gen features). For reference, this version was released by Rockstar
GTA 5 New Update on January 27 Applies Version 1.56 Fixes - MP1st