Alright @dcortese, I have some more steps we can try! In looking through other experiences and stuff on the net regarding the error 1719, I found some instances where the Windows Automatic Update was not allowed or done recently. Updating the PC then allowed the programs to be installed successfully (this was for various programs not including TurboTax). If you can, I suggest following the steps below.
Update Windows, even if you've seen a Windows Update recently:
Select the Start button, then select Settings > Update & security > Windows Update . Then select Check for updates. Reboot the computer, and check for updates again once more (yes, check for updates again!).
Note: To enable automatic updates select Advanced options, and then under Choose how updates are installed, select Automatic (recommended).
If there are no updates at all to download, please reboot the computer. Once the computer has been updated or restarted, run the install process for TurboTax again.
Please let me know if this helps.
