You can transfer it.
There are two ways to transfer from an Online return into the Windows Desktop program
1. You will need to download the .tax2017 file from online. See this for how to download the .tax2017 file,
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-the-return-i-filed-i...
Then start a new return in 2018 (go to FILE - NEW) and the very first thing it should do is search your computer for all 2017 files. If it doesn't find it you can click Browse and point to where you saved it.
2. If you can't get or didn't save the .tax2017 file to your computer before online was shut down in mid Oct. or lost it, there is a way to do it by starting your 2018 return in the Online version, transfer into that and then you can switch and continue in the Desktop program without having to pay for the Online version. Here's how:
https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-th...
Transfer into Windows Desktop program
https://ttlc.intuit.com/community/entering-importing/help/transfer-last-year-s-return-to-turbotax-fo...
