Mount and Blade free on Steam

I tried this and confirmed working.
Steam still says its a demo, however you can keep playing after lvl7 which the demo doesnt allow.

The only thing you got to do is to download the DEMO of Mount and Blade and when you launch the game you'll see a screen which shows you 3 options:

1)Buy a Serial Key Number
2)Enter your serial key number
3)Continue to play on Trial Mode.

You'll choose the second option,when you'll press it you'll see a screen which tells you to insert your serial key.
The Key is:YDZE-HDDJ-EYCN-XPC7.
And enjoy.

So let's Recap:
INSTRUCTIONS
Folow these 3 simple steps...
1. Get the mount and blade trial
2. Go to serial key/number type in YDZE-HDDJ-EYCN-XPC7
3. and there it is.