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1)  Also, some W11 updates were jut issued....if partially installed, that will block the TTX installation.

Check for those W11 updates, make sure they are fully installed and reboot your computer just in case.

2)  If a brand new W11 computer that TTX has never been install on...make sure the computer isn't in W11S-Mode

Switching out of S mode in Windows - Microsoft Support

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*