Supreme Commander 2 on the ZXnet FTP Archive
This is the FTP Archive on ftp.zx.net.nz. It contains the following:
Supreme Commander: Forged Alliance; a stand-alone expansion for Supreme Commander.
Supreme Commander 2 is a STEAM game. As such, patches are only distributed via STEAM. Patches are automatically checked for and applied when the game is run. They can not be manually downloaded and applied. No patches will be stored in this FTP Archive or linked to from here. You can, however, install the entire game with one click: steam://install/40100 (assuming its on your steam account).
Supreme Commander 2: Demo
The Supreme Commander 2 Demo is currently only available via steam.
At the Steam Store: http://store.steampowered.com/app/40140/
Or just install it with one click: steam://install/40140 (Requires steam)