Something doesn't gel. If your 2017 return was prepared in Deluxe Edition, free access to it doesn't expire until October 31, 2019.
If your 2017 is locked, and it's asking you to pay, and if your 2018 return is now in PLUS, we can tell you how to pay the 19.99 by credit/debit card by going to the Print Center (we can tell you all the steps.) Whatever you do, do NOT upgrade beyond PLUS, or you'll have trouble.
But if you really used Deluxe in 2017, you should have free access to your 2017 return through October 2019. Are you sure you used Deluxe last year? If so, you'll need to phone TurboTax Support to see why the return is locked.
Or could you have prepared and filed your 2017 Deluxe return in another account? We can tell you how to look for multiple accounts. It's possible the 2017 return in your current account is not the finished return you filed.
