M3-Lite is free and can be downloaded from this site. Current download size is less than 400K bytes. It consists of one M3SETUP.EXE file that will automatically unzip itself when you execute.
There are no restrictions on this Beta version and it is a full working version of M3 with up to 240 jobs and 256 I/O devices.
Download M3-Lite !
M3-Enterprise and M3-Developer provide additional functionality and will be released following M3-Lite.