SOLVED - UPDATE: After some googling and troubleshooting, I found advice to restart the Mac after the download. Very simple, and yes, it worked. After reboot, TT starts and appears to be working normally. It successfully imported last year's return and seems ready to go for 2023.
One added note for any others having similar issues.
Installing from the website download link gets you an already-updated version of TT, so I learned you can just bypass the CD and get the software by downloading from the website. That will save a little time after the first launch because it won't have to go out and get all the updates after the very early version that you get on the CD.
Joe
