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When I purchase turbotax online, how can I reload an older purchased copy of Turbotax?

I have been purchasing Turbo Tax online for a couple of years now.  However, what happens if I buy a new computer and want to have those downloaded versions installed on my new computer?  Can I go back to prior years' versions?  What if I don't have the installation key?  These are all concerns as I have had the need to go back to prior years in the past but that was when I had CDROM versions with they key....