SuperCard remains a 32-bit application and will continue to be for the foreseeable future. This means it is not compatible with Catalina (macOS 10.15) or later versions of macOS. SuperCard is currently natively compatible with any Mac running macOS versions Tiger thru Mojave, so we recommend Catalina+ users consider a Parallels Virtual Machine with an older OS version that supports SuperCard.
We have prepared a video tutorial outlining the process of creating a virtual machine using Parallels Desktop, and installing a guest OS to run SuperCard. The process is quick (not including macOS download and install time), easy, and SuperCard performs quite well in this environment.