Pro Tools 12.8.3 for Mac is a maintenance update primarily focused on macOS High Sierra (10.13.2) support and performance enhancements. It was the first version to fully qualify for High Sierra 10.13.2, though users were warned to avoid 10.13.1 due to installer issues. Key Features & Enhancements
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Below I assume you want a safe, legal way to install Pro Tools on three macOS machines and configure it to support large I/O/track counts. Pro Tools 12
AVE (Avid Video Engine) Updates: Introduced support for the XAVC Long GOP codec and 1080p50 files. Keep Pro Tools and audio interface drivers on
But here is the reality check: That specific file is nearly impossible to find on Avid’s official servers.