Difference between 710 RC1 and 710 RC2
From LinuxMCE wiki
When we first shipped RC1 it happened to coincide with an Ubuntu release. Ubuntu's servers were under very heavy load and downloads took a while to complete. We later discovered that we were missing a few debs in the downloads from Ubuntu, in our deb cache.
If you installed RC1 at any other time, however, these missing packages were automatically downloaded during your installation. You don't need the RC2 disc to obtain them.
RC2 includes minor changes in the ZWave Driver, which is currently under active development. If you are using RC1 and need the most recent ZWave Driver, you can get it by directly installing the debian package:
wget http://linuxmce.org/710rc1_update/pluto-zwave-lighting_220.127.116.11.0804202200_i386.deb sudo dpkg -i pluto-zwave-lighting_18.104.22.168.0804202200_i386.deb
wget http://linuxmce.org/710rc1_update/pluto-zwave-lighting_22.214.171.124.0804202200_amd64.deb sudo dpkg -i pluto-zwave-lighting_126.96.36.199.0804202200_amd64.deb