I had the same problem and have Nord VPN (has some similar issues with some other sites with Nord being the cause so I suspected it in this case). Disconnecting from VPN did not solve the issue but disabling both "Advanced browsing protection" and "Ad and tracker blocker" did fix it. Found out that installturbotax.com as well as https://turbotax.intuit.com/personal-taxes/cd-download/install-turbotax/ works fine with VPN connected, just not with "Advanced browsing protection" and "Ad and tracker blocker" enabled.
