http://www.aspyr.com/product/info/85

Over View:
Fire up the fretboard, crank up the amp, and get ready to rock like never before. Guitar Hero III drops you into the spotlight of the largest and most legendary rock concert ever. The star-studded soundtrack includes more than 70 songs including master tracks such as Even Flow, Welcome to the Jungle, and One.
Along with the standard Guitar Hero features, this new edition includes the new multiplayer action-inspired battle mode, grueling boss battles, a bevy of exclusive unlockable content, and authentic rock venues.
Features:
More than 70 of the most legendary rock anthems of all time
Added multiplayer modes: arcade inspired Guitar Battle and the dual shredding co-op career
Challenge Slash and other legends of rock and roll in boss battles
Take those axe shredding skills online and rock around the world
All-new tricked-out venues
Favorite characters freshly fitted with a few new faces
Fully playable with keyboard or keyboard/mouse
ESRB content rating: T for "Teen" (Lyrics, Mild Suggestive Themes)
System Requirements
Mac OS X v10.4.10 or v10.5 or later
2GHz or faster Intel Core Duo processor (2.33GHz recommended); does not support PowerPC processors
1GB RAM (2GB recommended)
6.1GB free hard-disk space (5.1GB + 1GB swap file)
Video card: ATI Radeon X1600 or nVidia GeForce 7300
Video memory (VRAM): 128MB (256MB recommended)
DVD-ROM drive
Macintosh mouse and keyboard
Supported video cards: NVIDIA GeForce 7300, 7600, 8600; NVIDIA Quadro FX 4500; ATI Radeon X1600, X1900, HD 2400, HD 260

Please note it only works on INTEL Macs. Instructions, crack, and full installer is provided. Also apparently you need an update/patch from the developer's website. Be sure to read the comment below for help.

http://rapidshare.com/files/128772849/GHIIIMac_highdefw.part01.rar
http://rapidshare.com/files/128774058/GHIIIMac_highdefw.part02.rar
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