I have old projects that were created in PP 12.1.2 2020 that worked perfectly with 3rd party plugins installed. However PP 12.1.2 no longer opens on my MacPro6,1 MacOS10.15.7 and I cannot re-instal it again as it is not available in CC. Some projects I have upgraded 14.9.2 successfully but some do not. Most do not upgrade to PP 15 (including the latest) and above because the blend modes display incorrectly. I have deleted caches etc. I have also tried importing sequences into later versions but getting hangs, crashes and PP Headless error. I have not upgraded the OS.
I also have the similare issues when opening on a recent MacPro Laptop.
It has become a nightmare to access these important projects.
Model Name: Mac Pro Model Identifier: MacPro6,1 Processor Name: Quad-Core Intel Xeon E5 Processor Speed: 3.7 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 10 MB Hyper-Threading Technology: Enabled Memory: 64 GB Boot ROM Version: 422.214.171.124.0 SMC Version (system): 2.20f18