Compiled in september 2008 Cosmos 2.0 reuse (and extend!) all the features of the old Cosmos XT 1.0 (the one of this page) compiled in june 2005. So we must not believe that Cosmos XT 1.0 is better than Cosmos 2.0... it's the contrary.
The only plugin remaining is Cosmos 2.0. The old Cosmos XT 1.0 (the one of this page) is discontinued and not necessary to try to find anywhere.