Comprehensive lists of Guitar Hero mods, including historical 'Extreme' versions, are often discussed on Reddit's Guitar Hero community
To play custom ISOs on modern hardware, most users rely on the PCSX2 Emulator Guitar Hero 2 Extreme Vol. 2 Iso Google Drive
by MiloHax is the current gold standard, offering enhanced graphics and engine improvements over the older Extreme volumes. Comprehensive lists of Guitar Hero mods