The latest development version is 0.4. Source code can be downloaded from the Launchpad project.
There are no binary packages yet.
Compiling VFX is much like compiling most other Linux software:
$ cd src/ $ ./configure $ make $ sudo make install
The configure script will print a summary of what it found and what it didn't find. It'll tell you if anything vital was missing. If it complains that the "Nvidia extensions" are missing you'll need to install Nvidia's proprietary driver, which comes with certain libraries that VFX Performer relies on.