Concerning After Effects 17.1.1 on Mac OS 10.15 (Catalina):

After Effects 17.1.1 running on MacOS 10.15 (Catalina) is not compatible with Continuum 2020.5 (13.5.0) and earlier.
If you are experiencing instability with Continuum 2020.5 (13.5.0) please update to version 13.5.1.

Please install using the Trial License FV3AV2-X1533E5-D1FX6 if you do not have a serial number for Final Effects Complete AVX.