You can download the package from the SourceForge area of the Moblin4Children Project.
This M4C version is the 0.1.0, and it has been tested on two versions of Moblin Live Images: 10 July and 21 July (the beta).
The release is Experimental and it is based on the GIT version of GCompris (MASTER HEAD).
How to install: you need to untar the archive and to run the installer m4c-install:
tar xvjf m4c-0.1.0-moblinv2a2-2009july21.tar.bz2
cd m4c-0.1.0-moblinv2a2-2009july21
./m4c-install
Let me know if you have some trouble.
Note(1): It replaces files under /etc/xdg, and backup them under /var/m4c/backup.
Note(2): The software is provided “as is” and without warranty of any kind.