macOS 10.14 (Mojave) is the last that will support 32-bit apps, so when starting TempoPerfect, the macOS displays a message to indicate this. From what I've read, macOS 10.15 (Catalina), which is to be released this autumn, will not run 32-bit apps, and it appears that TempoPerfect includes some 32-bit code. Will you update the app before then? Thanks!