This is where most users fail. The OBB must go into a specific folder:

: Ensure you have at least 3–4 GB of free space . While the compressed download may be around 1.6 GB, the full installation usually requires more.

. It is always recommended to purchase the game officially to ensure file integrity and receive updates. The Definitive Edition: Note that Netflix subscribers can now play the GTA: San Andreas – The Definitive Edition

The application installer that contains the game's executable code.