If you purchased TurboTax Self Employed this year, you should be able to enroll in the bundle. See if the information in the TurboTax FAQ below helps you out. Please post back in the comments here if you have difficulty.
https://ttlc.intuit.com/replies/5566112
*** 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.***