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Codimension IDE version 4.0.0 and up (Python 3)
The IDE is pip installable. See the detailed instructions here
Codimension IDE version 3.0.2 (Python 2)
The packages are built for a few Linux flavors and you can download them from here. This page also has links to some of the previous releases if so.
You can also download the IDE source code and the details are here. The page also provides links for browsing the source code online.
Building and Running from Source
The final option is to build the modules and run the IDE from source. The step by step instructions are here. These instructions may also be of help if you would like to port Codimension IDE to your platform.