Nonetheless, it’s possible to have diverse Pro Tools system installed in your PC (10.3.6 and 11) at the same time.
1: If you had any version of Pro Tools 10 download or higher versions installed in your OS (operating system), the first step is removing the application program from your system.
Additionally, matchless performance and no other one can be compete What’s new in V2020: Pro Tools 2018.1 not supported Mac OS 10.10 Yosemite, this is fixed in this version Fixed macOS High Sierra 10.13.4 due to performance issues.