Older Tiberium Sun Games

Hello.

I recently hit a wave of nostalgia and wanted to play the older C&C Tiberium Sun games (mostly Firestorm) but realized that I lack the CD-codes, manuals, CD-cases, everything but the disks which I have kept in great condition. Is there any possible way I could get some kind of digital copy or some kind of code to a game I played and enjoyed thoroughly when I was much younger without having to buy the C&C Ultimate Collection or whatever it goes by?