Pro Tools 10.3.10 needs to write files to system-protected directories that Apple locked down starting OS X 10.11. You must temporarily disable SIP.
Pro Tools 10 is a application. macOS High Sierra is the last macOS version that can run 32-bit apps (macOS Mojave and later dropped them entirely). However, Avid only officially supports Pro Tools 10 up to OS X 10.8.5 (Mountain Lion) . install pro tools 103 10 on high sierra
: The most common issue is a broken user interface, such as blank pull-down menus or a missing plugin list. Installation Blocks Pro Tools 10
: Install the latest High Sierra-compatible drivers for your audio interface before the software. 2. Run the Installer Protools 10 installation on High Sierra - Facebook macOS High Sierra is the last macOS version
: The standard installer will likely trigger an "incompatible version of the OS" error on High Sierra.