Are you using the Online version or the Desktop program? Just say no to transferring 2017. You can do 2018 without doing 2017.
If you are using the online version and its trying to transfer 2017 or transferred an incomplete 2017 you can start over.
There is a tricky way to clear out transferred info in the Online version. But doing this will also clear out all your entries. Go to Tax Tools > Tools > Transfer from your computer > Continue > then Continue without transferring.