Hey guys! As you can see from the title, my Civ 4 cd is scratched. I bought it about a year ago off amazon and it's the regular game plus the Warlords expansion. I haven't played in a few months and about an hour ago got all excited about wanting to play again. I found the disc and was horrified to discovered that it's all scratched! My macbook pro optical drive tries reading it then just spits it out after about a minute, I tried like ten times. 
I did a search online and despite there being some "cracks" to get the pc version to play without a disc, I see nothing for mac. One page alluded that if I buy the BtS digital download then I no longer need the cd. Is that true? It's 10 bucks so much cheaper than me buying the full game again. Thanks for any help guys, for the record I legally own the game, I still have the box and could produce my receipt from amazon.com if needed. Thanks a ton!

I did a search online and despite there being some "cracks" to get the pc version to play without a disc, I see nothing for mac. One page alluded that if I buy the BtS digital download then I no longer need the cd. Is that true? It's 10 bucks so much cheaper than me buying the full game again. Thanks for any help guys, for the record I legally own the game, I still have the box and could produce my receipt from amazon.com if needed. Thanks a ton!