Photoshop Elements 2020 and Premiere Elements 2020 work with macOS 10.15 (Catalina)
There are someknown compatibility issues that we are aware of. Please checkout the known issues list and if you fell your workflow is going to be greatly impacted, you may want to remain on your current version of macOS until these issues have been resolved.
If you encounter issues that are not documented here, reach out to Customer Care by clickingthis link. In the chat pod, once you've signed in, type the issue that you're facing - as shown below.