I never did get my TurboTax working on my Windows 10 Pro machine after trying all the hints people posted on here as well as after spending hours on the phone with TurboTax help staff. I had to use the online TurboTax version, very annoying and less capable. For example, you can't just open up a specific IRS form and update it. Costco did return my purchase no problem.
Very dissatisfied with TurboTax this year.
