Playing A Game I Own Is Very Difficult...

[Thermal]

I really want to re-install medieval 2 total war on my computer, I own it but deleted it to make way for Empire's (if I knew empires would be so 'meh' i wouldnt have bothered) but around the same time my disk drive broke Empires runs on steam so i dont need a disk but medieval 2 on the other hand....

Well doesn't anyone know anyway I can play medieval 2 without a disk drive legally? Is there a way the medieval total war 2 information can be transferred without getting it directly from a disk (memory stick?) Any help would be appreciated, baring in my mind I don't plan of buying a disk drive anytime soon unless it's dirt cheap.

P.s: the main reason for reinstalling it is to play broken crescent again, I loved that mod!

P.s: I'm starting to doubt this is possible legally lol but if anyone knows its you guys