It's annoying, but no real way to stop it.
One year I had 3 non-used states that downloaded and updated because I had used them "sometime" in the past.
I never got rid of them until I moved to a new computer, and re-installed programs for the past 3 yrs of TTX software. Since none of those 3 yrs had actually used another state on the new computer, they never showed up again.
I "think" someone finally found a way by messing around deleting certain files in the TTX program directories....but it was a bit convoluted, and not sure it wasn't just temporary.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
