I think you need to log into online from a real computer at least to transfer from your .tax2018 return. All you need is the .tax2018 file. You can use any full computer like a friends or family.
If you used the Desktop program last year here’s How to transfer into the Online version. You need to have the prior year .taxyyyy file on the computer. Go to Tax Tools > Tools > Transfer from your computer > Continue >
Expand the link if you used the CD/download last year........
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
If you used the Desktop program before you may not like the online version. It has less features and no Forms Mode. You can only do 1 return. Your return is only saved online so be sure to save both the .tax2019 data file and the pdf file to your computer when you are done. In case you need to amend in the future or if you need a copy to get a loan or something. You might not be able to access your online return when you need a copy.
