@RogerS1
I'm not sure the MAC software (you used historically) has had the ability to turn off the update...like the Windows software does. Not sure why...seems like it should be an easy programming function.
Or are you using Windows software now? in which case the directions @DoninGA would work.
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I'm not a MAC user, but i "think" some MAC users have said they had to shut down their internet access entirely on their computer, before opening the TTX MAC software, so that the attempt to update would be bypassed.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
