Does your computer meet the system requirements?

TurboTax 2017 Minimum System Requirements

Windows:

https://ttlc.intuit.com/questions/1901571-turbotax-for-windows-minimum-system-requirements

Mac:

https://ttlc.intuit.com/questions/1899173-turbotax-for-mac-minimum-system-requirements

Customer support will available on Tuesday after the long holiday weekend.

To call TurboTax customer support

https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number

They are available from 5 a.m. to 5 p.m. Pacific time  Monday-Friday

My computer meets all the requirements.  Have Windows 10.  I have other years of Turbo Tax downloaded with no problems

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...

If you downloaded the wrong installation file (.dng for mac  instead of exe. for win )  then post back for more instructions.