Pro Tools Operating System Compatibility Chart - Knowledge Base
For most users running stable 10.3.8 or 10.3.9, upgrading to 10.3.10 + R3 offers minimal benefit and introduces negligible risk. Avid Pro Tools HD 10.3.10 R3 hotfix only For Mac
This hotfix is explicitly not for Pro Tools vanilla (non-HD), Pro Tools 10.3.9 or earlier, or any Windows system. Attempting to install on unsupported platforms will corrupt your application bundle. Pro Tools Operating System Compatibility Chart - Knowledge
: Mac OS X 10.7 (Lion) through 10.8.5 (Mountain Lion). Pro Tools 10.3.9 or earlier