I upgraded to the latest release last month and went to use the Contact Sheet II, only to get an error message saying there was a program error, which was then followsed by a further message stating an unonown operating system error.
The Contact Sheet worked fine before the upgrade.
I am using a 2017 MacBook Pro, 3.1Ghz, 16 MGB of Ram, 1TB hard drive, running Catalina.
Not many of us on this forum are familiar with Macs. Since nobody has answered your question yet, I suggest you contact Adobe Support. You can start a chat session by clicking on the blue Contact Us button under the Support menu at Adobe.com.