gmod 11
The latest version of the Aether mod is for 1.0.0
Garry's Mod 10. When people refer to Garry's Mod 11, they mean the up-to-date Garry's Mod 10
The latest. Minecraft 1.0
Because you dont have Mod loader installed Google it to find out what it is
you have to downlaod a mod seach for a mod loader and the mod its self
Because you probably don't have mod-loader installed. Try reinstalling it.
It works fine on a vanilla version (no mods) so it probably means you have a mod for it so you will have to wait for the maker of the mod to update it to the latest version.
No. I use that mod and I don't have mod loader.
Go to www.garrysmod.org and download the latest version of DarkRP.
Just search in google 'Minecraft mod downloader'
search it in the forums :)
Yes, however it may not be compatible with the latest version of S.T.A.L.K.E.R.: Clear Sky (version 1.5.10).