You have to install the program. Call and see if you can get the download.
Contact Customer Service
5am-9pm Pacific Time Monday -Sunday
https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
Or you might be able to use the special amend program. It's for online returns but try it. 2018 Amend programs for Windows
https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty18
