Contact customer support to push a download of the software you need to finish your return. It will now have to be printed signed and mailed--it is too late to e-file.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
They are available Monday-Friday from 5 a.m. to 5 p.m. Pacific time.
To finish a prior year return started in TT online:
https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb
https://ttlc.intuit.com/questions/1899646-what-if-i-missed-the-october-16-filing-deadline