Pro Tools 11 introduced AAX and killed RTAS support. It also killed the 32-bit bridge
Unsupported by Avid. Practical Feasibility: Possible with significant limitations and workarounds. Primary Challenge: Pro Tools 10 is a 32-bit application; macOS High Sierra is the last version to support 32-bit apps, but Avid never certified PT10 beyond OS X 10.8.5 (Mountain Lion). Target Audience: Legacy session access, users maintaining old plugins unavailable in 64-bit.
: You may need to grant permissions in System Preferences > Security & Privacy to allow software from "unknown sources" to run. Critical Known Issues install pro tools 103 10 on high sierra
If you must proceed, community-developed methods involve bypassing the installer's OS version check.
Pro Tools 10 was the last version to rely heavily on the RTAS (Real-Time Audio Suite) format and the DAE (Digidesign Audio Engine). By the time High Sierra rolled around, Apple had aggressively moved toward 64-bit architecture. High Sierra was the final macOS to support 32-bit apps "without compromise," but it was already hostile territory for the older code. Pro Tools 11 introduced AAX and killed RTAS support
If you must proceed, you can bypass the OS check using to extract and run the installer components manually:
Avid released a silent “late‑life” update for PT 10 on unsupported OSes. Download the “Pro Tools 10.3.10 High Sierra Fix” (search Avid’s Knowledge Base or DUC). It contains a single file: a modified ProTools.app . Replace the one in /Applications/Avid/Pro Tools with this patched version. Primary Challenge: Pro Tools 10 is a 32-bit
Apply the PT10_HighSierra_fix.dylib to bypass CoreAudio initialization crash: