override!!!

i dont get override how do i change up override and i dont get then why some of the garrys mod.org downloads work and some dont. if some one can explain override to me i would be very greatful and tell me how to change it

oh and my last prob i sorted out so dont bother reading it

If we can’t understand what you are saying, we can’t help…

What do you mean by “override”?
Some addons on gmod.org don’t work because they’re old. Gmod is constantly updated so that old addons break.
Since I can see you’re new I suggest reading this: http://www.facepunch.com/showthread.php?t=688324 (If you want to get the coolest and best addons)