macOS Sierra 10.12 not yet supported
 

Avid is in the process of qualifying this new OS, but it is not recommended at this time.

Please see avid.force.com/pkb/articles/compatibility/macOS-10-12-Sierra (Subscribe to be notified of changes).

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Related info:

• Pro Tools Operating System Compatibility Chart
• Pro Tools 12.5.2 Information & Downloads
• macOS Sierra FAQ: What you need to know about the new Mac operating system
• How to downgrade from macOS Sierra to El Capitan