You can't place it in Scene Editor mode.

You have to start a Skirmish and buy it as a brain, or in the Scene Editor, go to "Test Scene" without having placed a brain, and you should find it under brains.

Also, you can't buy it in campaign, as all the brains are already predetermined, and you can't buy additional brains.

Scene editor? But, I'm playing the demo version of this game.

Hey LFOW how's the armored brain unit update coming along I'm getting very curious.

Update won't be for a bit.
It's being worked on in random spare moments while mostly right now the Dummy Factory is getting it's final polishes for release.

Problemos senior!
As far as I know the demo won't load any custom .rte , so you can't play the demo with mods
although I've seen and heard ways of getting around it...

Wat? Justin, the Behemoth is a BRAIN so place it as a BRAIN, you cannot buy it in game because it is a BRAIN. Oh, and yes, 1nfernal, there is a way around it, get any damn version that's not B19.

I KNOW it's a BRAIN. My PROBLEM is that I don't see IT as a BRAIN in the BRAIN folder, and I don't see it ANYWHERE, mi amigos.

And, what are you talking about? I'm playing the game with mods right now.

/facepalm
I have personally unregistered my game and tried it. Just now. The demo loads custom .rtes.

Funny, I didn't work when I had B22 , after all, I've only had the game registered since B23

But I did have my ways of getting around that of course... Dark magic I tell you... It's the reason I felt guilty and bought the game at full price

How do I check my Cortex Command build version and upgrade it?

You can check for certain devices that are only in B23. For example, The Coalition Homing Misslie Launcher is Lua operated, and Build 23 is the first build to enable Lua in Skirmish.

Uh, Infernal, custom .rte's have loaded in demo versions of at least B20, 21, 22 and 23. Dunno about others.

I have that homing missile launcher thing, but how do I start Lua in the middle of a skirmish?

Lua is automaticly run if a device that uses Lua does something to activate the Lua. In other words, Lua is activated automaticly.

Have you even tried using the homing missile launcher?!? whenever you use it, the missile automatically starts up the .lua file, so it can be usable in any mode. Before B23, Lua could only be used in missions. For example, if you were to port the Coalition missile launcher to, say, B22, you would have to attach a .Lua to a mission, and it would only work there. An example of what Lua weapons had to do to be used before was the portal gun. In B22, there used to be a mission exclusively to use the portal gun, because you could only attach Lua to missions, not other stuff. Now, since you can attack Lua to alot of stuff, it can work anywhere, anytime.