ChrisH. Seeing a very similar problem as you are with TurboTax 2018. Also, saw the same problem last year and I was finally able to track it down to needing the specific version of .Net Framework specified on the package, namely 4.5.2. They have been specifying version 4.5.2 since TurboTax 2016! What is amazing to me is there is a TurboTax FAQ (1900095) that says "Windows 10 comes with .NET Framework 4.6". I would sure like to know how Intuit tests TurboTax with Windows 10, because unless it's a very early version, I don't think it works. Unfortunately, what I did last year was drag out my old laptop with its slow Windows 7 spinning disk and install TurboTax on that.
