Work-Around below.
I have a brand new Windows 10 Professional Install. Nothing else on it since I bought it just to run this program. But apparently Intuit doesn't bother to test their products before release. You couldn't ask for a more basic product test than to install on a clean OS install and run the program.
The dots spin forever. I finally solved it by installing Firefox and changing Windows to use Firefox as the default browser for both HTTP and HTTPS (run Firefox, it asks to be the default. Say OK. This brings up a Dialog box in Windows. Use select app by protocol. Switch HTTP and HTTPS from Edge to Firefox.)
Now starting TurboTax works. Shame it doesn't work withe the default browser for the version of Windows they just forced me to buy to run their product.
