You can download the total formalization or just specific parts of it.
To download the full system, just click on the first link. The partial distributions should be self-contained, e.g. you do not need to download Core in order to use Algebraic Hierarchy. After you untar the files (which will create a CoRN/ directory at the place of installation) you will find a.o. a README file which contains more detailed instructions on how to proceed. It is (unfortunately) quite likely that all will not go well, especially if you only download parts of C-CoRN; if this happens, please contact me.
You can also use Git to get the latest development of CoRN and its recent development history by cloning our repository:
git clone http://www.fnds.cs.ru.nl/git/CoRN.git
This is particularly recommended if