Emma decided to take a similar approach. She downloaded a legitimate copy of an older Photoshop version from Adobe's website and installed it on a separate partition. It wasn't the latest version, but it would have to do.
You cannot update the software. If a security vulnerability is found in Photoshop 2020, your system remains exposed. The Hidden Dangers: Security Risks crack photoshop 2020 mac catalina
For those interested in using Photoshop 2020 on their Mac: Emma decided to take a similar approach