The modding community moves fast, but Rockstar Games moves deliberately. Version corresponds to a specific patch of GTA V (often associated with the San Andreas Mercenaries update period). Using a gameconfig from the wrong game version is a recipe for disaster.
A full config removes the limit on how many Add-On cars you can have before the game fails to load. gameconfig gta v 103501 full
Note: If you don't have this structure, copy update.rpf from the base folder to your mods folder using OpenIV. The modding community moves fast, but Rockstar Games
Search for “Gameconfig 1.63” or “Gameconfig for 103501” on reputable modding sites (e.g., GTA5-Mods). Look for one updated in late 2021–2022. Example filename: gameconfig_103501_1.63_by_YourModder.zip The modding community moves fast