If you purchased the 2017 TurboTax software as Mac download, you will have to contact TurboTax support so they can push a 2017 Windows installation file to your download account.
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
