You must have custom firmware installed.
Before searching for a direct , consider the only legitimate (and safe) method. This requires you to own the game legally on another platform.
: Ensure the folder structure is ux0:data/gtavc/[game files] and not nested (e.g., avoid ux0:data/gtavc/gtavc/ ) to prevent crashes.
This file manager is required to transfer and install the VPK.
This is infinitely safer than messing with unknown VPK files.