I want to install Ubuntu 10.10 because I don't like Unity. If I install compiz fusion via terminal, will it be the 0.8 version, or the latest one, which is 0.9.6?
Jason, knowing the real reason you want to do this, from your previous questions, let me first give you a warning before answering. Compiz 0.8.x is not maintained any more (beyond simple bug fixes). As I have said over and over and over... Compiz-fusion is dead, and the project is now called Compiz.
That said, if you install 10.10, you will be getting Compiz 0.8.6 (it is installed by default, you don't have to install Compiz from the terminal on any version of Ubuntu since 7.10!). However, while some of the plugins you are so excited about may work, many of them will cause Compiz to become unstable, crash, and God knows what else (I'm speaking from experience, not just from guessing - I used to run just about every plugin I could find).
Again let me reiterate some things:
That said - if you want to go ahead, you can install 10.10. Just remember that half of what you wanted to do according to your other questions might end up breaking the system if you don't know what you are doing.