If I have Microsoft Office product key, can I install w/out disks?

I’m hoping to install Microsoft Office 2004 for mac on my new mac laptop… but when i dug around for my install disks from my last computer, i found the case w/out the disk inside. awesome. so i have the product key and no disks… it seems like the opposite problem of alot of other posters in this forum.

is there any way for me to download the program files from somewhere, for use with my product key? i’d rather not re-purchase something that i’ve already bought, less than 3 years ago.