It can be done, and easily! See the TurboTax FAQ below for instructions (Option 2).
https://ttlc.intuit.com/replies/6419943
The upgrade cost will be the difference in pricing between the Deluxe Edition and the price of TT Deluxe Live had you selected it initially.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
