The online version and CDROM installations are the same, however the CDROM is an uncompressed MSI package (as opposed to a single file compressed MSI) which is generally easier to distribute over a school network.
Therefore we recommend use of the CDROM for networks (supplied in all starter packs or available separately as part BAS805).
Part 1 of the manual (see datasheets section of website) has further information on RM CC3 network installs.