Final Cut 7 as it runs on 10.5.6 or higher. Final Cut 8 does not run on 10.5.8. Check out the related link below for more of the specs for Final Cut 7.
Open the project with the updated version of FCP.
The current version of Final Cut Studio is 2. The full version of Final Cut Studio 2 costs $1,299.00/£831.00 from Apple stores. You can find it elsewhere at a discount such as Amazon - $1,149.99 / £675.03.
The most recent version, Final Cut Pro X 10.1, runs on Intel-based Mac computers powered by OS X version 10.9 or later.
Apple's Final Cut Express software only works on their Mac computers. There is no version for the Windows operating system.
A boxed version of Final Cut Express can legally be purchased from either Apple or another retailer and is not available as a free download.
There is no downloadable trial version of Final Cut Studio. This is probably because it comes on nine DVDs and would be impractical to download.
Final Cut Pro
Extended cuts are referencing parts of a movie that were recorded but did not make the final cut. These "cuts" may be added to the movie, sometimes at the end, and is referred to as the extended cut version.
The Final Alliance - 1990 is rated/received certificates of: Iceland:16 USA:R West Germany:16 (cut version)
Final cut pro X
Backward compatibility will almost certainly be a problem. But it will depend upon just what the project contains - try it and see what happens. Ideally you would have exported your project with the Export XML... option using an early version such as XML Interchange version 3 from FCP6 so that FCP5 could import it back in.
Final Cut Pro is the best editing system and for effects is Adobe After Effects.