The stock Avid uninstaller will fail on High Sierra. Removal must be done manually. Step 1: Prepare the Pro Tools 10.3.10 Installer

Pacifist bypasses the JavaScript system check embedded in the installer wrapper, placing the Pro Tools binary files directly into your /Applications and /Library/Application Support directories. Step 2: Install the Avid Virtual Instruments (Optional)

Once the installation completes, . Step 4: Post-Installation Fixes (Crucial)

: Use Time Machine or a cloning tool to back up your current configuration.

Because High Sierra handles system permissions and symbolic links differently than older OS versions, Pro Tools will likely crash on launch unless you repair its file structure.

Installing Pro Tools 10.3.10 on macOS High Sierra (10.13) is by Avid. Officially, Pro Tools 10.3.10 is only qualified for use up to macOS 10.8.5 (Mountain Lion).

. Standard installers will fail with an "incompatible version of the OS" error.