2017 is no longer available from Turbotax. your options are to do your return manually, find an (online) software service that still does 2017, or find a tax pro that can still do 2017. many pros retain older years apps for situations like yours. if you are due a refund it is lost because you didn't file within 3 years of the return's due date.
do not buy from online sellers of the Turbotax 2017 CD. it's not up-to-date and Turbotax has also shut down the updates for that year.
