See this TurboTax support FAQ for completing a 2017 tax return started with the online editions - https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb...
If you paid for one of the 2017 online editions of either Deluxe, Premier or Self-Employed then you will need to contact TurboTax support so they can push a 2017 installation file to your download account at no charge.
A 2017 tax return can only be printed and mailed, it cannot be e-filed.
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