Sign onto your download account to download the software purchased from TurboTax. You can download the TurboTax software purchased as a download for up to three years from the purchase date.
Sign onto your download account here - https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
Your tax files end in .tax or .tax2014, .tax2015, .tax2016 etc. They should be in your Documents in a Turbo Tax folder. You should also have the pdf files of each year. Or search your computer for all files ending in .tax. Also if you haven't done it, I would open each year in the program and save it as a PDF file, go to File-Save to PDF so you don't need the program installed.
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. After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program (go to File-New Tax Return).
Then go to FILE -Open and find your return.
See this article on how to move your tax return to another computer…….
https://ttlc.intuit.com/questions/1901474-move-your-tax-return-to-a-different-computer
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.