i just download lfs yesterday and havent been able to use single player mode, i dont know if it is a new update or what because it was like 2 years ago last time i play. if someone can help thanks

What exactly do you mean by "not able to use"? Does it show any errors?

no i click on it and it dont do anything, but it let me go multiplayer with no problem

Strange. You can try /sp command in the main menu.

thanks i reinstall it and start working