A v1.0.505.2 release will not include any of the content from the last several years of updates, including new vehicles, missions, or the technical improvements found in the modern GTA Wiki Title Updates No Online Access:
Includes the base game plus all released DLCs up to this version. CorePack Efficiency: including new vehicles
Works well for preservation, but know what you’re getting into including new vehicles
: The specific patch version of the game included in this file. (Note: This is an older version of GTA V). Inc. DLC-s including new vehicles
This era was the "Golden Age" of GTA V modding, and this specific build was often favored by modders for its stability with Script Hook V.