macOS Catalina is exclusively running in 64-bit. Legacy stand-alone versions of Photoshop will not work at all.The other is to simply wait to upgrade until the issues are resolved. Adobe recommends that users test these 3 applications on a separate partition that is not involved with actual production.
There are issues with Photoshop and Lightroom CC and Classic. Read this post before upgrading your computer. If you are a Mac user, the latest macOS Catalina is now available.
