Unfortunately, Apple discontinued FCP as we know it June of 2011. There is FCP-X (FCP 10), but it is an entirely different app, looking and behaving nothing like the older versions of FCP. It, and Motion are available as a download only from the App Store.
You may be able to find FCS 3 (aka FCP 2009, which included FCP 7) online on sites like ebay.
That said, why not tell us the specifics of the problem you're facing and who knows ... someone may have an answer for you that doesn't involve upgrading or changing apps..