Installation on other Linux systems (for which no packages are available) is quite hard as it must be compiled from source. If you can't download packages for your distribution, do let me know by email and I will look into providing packages on the website.
The following dependencies are required:
Once you have installed the development packages for the dependencies, download the source code from http://dcpomatic.com/, unpack it and run the following commands from inside the source directory:
./waf configure --disable-tests ./waf build sudo ./waf install
With any luck, this will build and install DCP-o-matic on your system. To run it, enter:
in a shell.