Did you maybe buy the Mac version? Call support. Did you try turning off your anti-virus program to download it?
Contact Customer Service (they might be closed until after Labor Day)
5am-5pm Pacific Time Monday -Friday
https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
How to Download
https://ttlc.intuit.com/community/installing/help/how-do-i-download-the-software-i-purchased-at-turb...
