How do I download Final Cut Pro without re-buying the software?

Welcome to the Apple Support Communities

If you have Final Cut Pro on a disc, you can't download it without buying it again, so you have to install it from the disc. You have two possibilities:

1. If you have another PC or Mac, use Remote Disc > http://support.apple.com/kb/HT5287?viewlocale=en_US

2. Buy an external optical drive and use it to install Final Cut.

Also, as you have Final Cut Pro on a disc, I suppose that you have an older Final Cut Pro version than the one that it's available for download

I can guess that the version number of your copy of Final Cut Pro is not the latest. I would suggest following Niel's suggestion above...

"Use an external optical drive, including one in another computer."

Jb

The problem though is that you'll never be eligible for software updates unless you purchase it or have received it as a gift from the app store. In both cases the purchase would be credited to your very own apple id.

Use an external optical drive, including one in another computer.

(78324)

There is no disc for FCP. It's only distributed through the App Store. It cannot be resold. It can be gifted using a gift purchase from the App Store with a redemption code.