Pro Tools 8.0 software requires Mac OS X 10.5.5 or higher, and is not compatible with earlier versions of Leopard, Mac OS X 10.4 (Tiger) or earlier versions of Mac OS X.
To update to Pro Tools 8.1.1, see the following: To update Mac OS X 10.6 for Pro Tools HD 8.1.1 compatibility, the following update is recommended: Pro Tools HD 8.1.1 is a free update for Pro Tools HD 8 owners. Pro Tools HD 8.1.1 supports the following Mac OS X versions, on Intel-based Macs only: To update to Pro Tools 8.0.5, see the following: To update Mac OS X 10.6 for Pro Tools 8.0.5 compatibility, the following update is recommended: Version 8.0.5 supports the following Mac OS X versions, on Intel-based Macs only: Pro Tools HD, LE, and M-Powered 8.0.3, 8.0.4, and 8.0.5 are free updates for all Pro Tools 8 owners. Pro Tools Software Versions Below 8.0.3 Are Not Compatible With Snow Leopard
Mac OS X 10.6 (Snow Leopard) Compatibility Information
This article links to the latest guides that explain how to configure your computer before installing Pro Tools. Optimizing Your Operating System for Pro Tools
For downloads and details, see the following: Although not officially qualified, Pro Tools 9.0.5 also adds public beta support for Apple's OS X Lion operating system. Pro Tools 9.0.5 is an officially qualified and recommended update for all Pro Tools 9 and Pro Tools HD 9 users on Mac OS X 10.6.x (Snow Leopard) and Windows 7. Pro Tools and Pro Tools HD 9.0.5 beta software on computers with Mac OS X 10.7.x (Lion) Pro Tools and Pro Tools HD 9.0.5 software on computers with Mac OS X 10.6.x (Snow Leopard) and Windows 7 (32-bit or 64-bit) Pro Tools 9.0.5 Update for Owners of Pro Tools 9.0 and Pro Tools HD 9.0 on Mac and Windows Pro Tools 9.0.5 Updates Now Available - Includes Lion Support System Requirements and Compatibility with Pro Tools|HD and Pro Tools|HD Native Systems with Pro Tools HD 9.0 Software: System Requirements and Compatibility with Pro Tools 9.0 Software: