@ldj2177 IF...if you used TTX Online for 2017, and you are in the correct account , then try the workaround a user posted in the final comment in the following (no guarantees ).
https://ttlc.intuit.com/community/after-you-file/discussion/re-prior-year/01/951264#M195037
Otherwise, as already noted, you may have to wait until the 2019 software comes online, and then the normal upgrade procedure for PLUS should become active again:
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
