It doesn't cost anything to efile. You can efile from all versions. Why do you need to upgrade? Does it say you need to mail?
If you haven't mailed it yet you can try to switch to efile.
Click on Add a State to let you back into your retun.
How to change from Mail to Efile
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...
