Im stuck on the demo???Can somebody help me please

Because you only have demo license....

I buy the S2 liscence 2 years ago

One of my friend that i play with got the same problem

https://www.lfs.net/faq/3

https://www.lfs.net/loginreset

If neither of those work, just contact Scrawen who always assists legal users who have a problem unlocking their game.

How

..

Quote from BigLgros :

I buy the S2 liscence 2 years ago

Quote from BigLgros :

One of my friend that i play with got the same problem

And the licence names are?

Quote from BigLgros :

I buy the S2 liscence 2 years ago

This account is from 2011 and demo.
Are you sure you remember the right username? There have been threads where people got confused because they used different names for demo/licensed. First step would be to figure out username of licensed account.
Use user search on http://www.lfsworld.net/ (type in parts of nicknames you might have used) or email devs. (With as much info as you have, maybe they can figure it out)