The c.o.p._variation_mod.rar file you have requested: Call of Pripyat / Mods / C.O.P. Variation Mod - 40.16mb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Call of Pripyat and upload any files you want to share or are missing. This is the only information we could locate:
Call of Pripyat Variation mod adds new skins & meshes to the variation of Stalkers in Call of Pripyat, no gameplay changes have been made and is meant to be used with vanilla just to add new skins and variations to the world.