First, try to find just the patch file ( .xdelta or .ppf ). Apply it to your own legal GH2 rip. That is the cleanest, most honorable way to unlock the Extreme Vol 2 experience.
Guitar Hero 2 Extreme Vol 2 is a popular fan-made modification (mod) of the original Guitar Hero II for PlayStation 2, featuring a custom tracklist and increased difficulty. Because it is a modified version of a copyrighted game, official downloads are not hosted on mainstream platforms, but it is widely preserved within the rhythm gaming community. Download and Availability
While you can use a standard DualShock 2, the game is best played with a Guitar Hero Controller . If playing on PC, you may need a USB adapter for your legacy hardware.
GUITAR HERO II (Extreme vol. 2) - playlist by 'ᵐᵘⁱⁱᵐ | Spotify