Works the same as installing current year programs
Go here, scroll down to ProSeries and Log in, you should find a link for Prior Year in the Downloads area, if the years you need arent listed, you'll need to make the dreaded call to support.
https://www.intuit.com/sign-in/
♪♫•*¨*•.¸¸♥Lisa♥¸¸.•*¨*•♫♪
