Mac OS X 10.6 (Snow Leopard)
Pro Tools Software versions below 8.0.3 are not compatible with Snow Leopard. Pro Tools 8.0.5 is a free update for Pro Tools 8 owners. Version 8.0.5 supports the following Mac OS X versions, on Intel-based Macs only:

Mac OS X 10.6.2 – 10.6.7 (Snow Leopard) Mac OS X 10.5.8 (Leopard) Mac OS X 10.6.3: Pro Tools 8.0.4 added official support for Mac OS X 10.6.3 and higher. Although there are no known issues with Mac OS X 10.6.3 and Pro Tools 8.0.3 systems, 10.6.3 and higher is not officially qualified or tested with Pro Tools 8.0.3. Please Note: Pro Tools 8.0. Here we show you how to upgrade to Mac OS X High Sierra. This covers all the steps you need to do the upgrade.If you can't find High Sierra in the Mac App St. If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

  • Mac OS X 10.6.2 – 10.6.7 (Snow Leopard)
  • Mac OS X 10.5.8 (Leopard)

Mac OS X 10.6.3:

  • Pro Tools 8.0.4 added official support for Mac OS X 10.6.3 and higher.
  • Although there are no known issues with Mac OS X 10.6.3 and Pro Tools 8.0.3 systems, 10.6.3 and higher is not officially qualified or tested with Pro Tools 8.0.3.
Higher

Please Note: Pro Tools 8.0.3 software (and higher) does not support some retired products, including:

Cached

  • Mbox (original model)
  • Macintosh PowerPC Computers

How To UPGRADE - Mac - Os - X 10.7.5 To High Sierra - YouTube

Please read the EOSS (End of Software Support) Announcements for more information.
To update to Pro Tools 8.0.5, see the following:

How To Free Up Storage Space On Your Mac - Apple Support

Dec 15, 2011 11:03 AM