...one other thing..which you may have done, but perhaps not....is to check for any partially-installed Windows OS updates...those are known to block TTX installs....those require a reboot after they have partially-installed.
And reboot your computer too, even if no updates are waiting. (after reboot, leave everything alone for ~ 15 min before you try installing TTX.
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Dang...just see one now when I checked.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
