There was also a message that came up that said 'Adobe Application Manager is corrupted and must be reinstalled'. The longer you've been using a Mac, the trickier the macOS.
Caution: For macOS 10.15 Catalina, it is particularly important that you research which applications you have on your Mac before you click that Upgrade button. Adobe Creative Suite 3 through 6 (CS3–CS6) Adobe Creative Suite 2 (CS2) Do not upgrade until everything you use is ready.
