Downloading MS Office 2008 to iMac without a port.

I have two licenses remaining on MS Office Home & Student Edition software purchased in 2008. It's supposed to be downloaded via the DVD provided in the packaging. Rather than purchasing a new "subscription" to MS Office as it's now called, and tossing out the 2008 version with its two remaining licenses I'd like to use them, one for my new iMac and one for my Macbook Air. Neither has a port. Is there any way to download them just using the license numbers...without having to attach something with a port to the two computers and doing it that way?