The answer above didn't say but you do not need to install the 2018 program. Just copy the .tax2018 file to the new computer to transfer into 2019.
What I would do is just copy the whole Turbo Tax folder that is under your Documents. That should be where the .tax files and pdf files are stored. Copy that folder to a flash drive or best yet is to burn it to a CD or DVD and then you will have a backup of them. Then on the new computer copy the folder (or files) from the flash drive to your Documents folder.
The programs need to be installed from the CD or download them again. You don't need to install them unless you need to amend or open a return.
See this article on how to move your tax return to another computer…….
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-move-my-tax-data-file-to-another-compu...
If you are moving to a Mac from Windows or to Windows from Mac you will need to install the right program. If you have the CD it has both windows and Mac programs on it. If you downloaded the program you might need to call in and ask for the other download. Unless you have both downloads in your account already.
