How can I amend my 2017 tax return if I need the Deluxe version, yet TurboTax is saying I already have the Deluxe version and not letting me download my 2017 tax return?

I need to amend my 2017 tax return (employer error where they left off some income). I am trying to do this through TurboTax yet TurboTax won't let me. First they say I need to get Deluxe. Then when I go to Deluxe they say I already have Deluxe. So I need help!