You can't copy the software from one computer to another. You have to install it on the new computer from the CD or download for each year.
You can copy your tax return data files to the new computer. They have the file name extension .tax20yy, where yy is the year. For example, the file name extension is .tax2015 for your 2015 tax return, .tax2016 for your 2016 return, etc. The default location for the .tax20yy data files is My Documents/TurboTax, but you could have saved them in a different folder.
