You put in "ID" somewhere at some time in the tax software in this, or some prior year...so Idaho downloads and updates incessantly for every year after...until you get a new computer.
It's annoying, and other than the waste of space, TTX has never given anyone a way to stop it.
BUT, you are not charged for it unless you actually try to use Idaho....yeah, many of us are PO'd about it too..but in the end, it doesn't hurt anything....just annoyance and disk space.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*