Might also be a good idea to check for, and install any main computer OS updates and reboot.
Waiting or partially installed Windows OS updates are known to block TTX updates. Reboot even if you don't see any OS updates. Then try updating TTX again. (Don't know whether MAC OS updates show the same problem).
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
