For install my mod ( Eternal Frost mod 1.5.2 ) you must :

1) Install Minecraft Forge latest recommended build.
2) Put the content of "Put on minecraft.jar" on your minecraft.jar ( C:\Users\You\AppData\Roaming\.minecraft\bin ) ( So all the three folder LIKE THEY ARE in the minecraft.jar )
   Put the content of "Put on .minecraft folder" on .minecraft folder ( C:\Users\You\AppData\Roaming\.minecraft )
3) Play and Enjoy !!


If there is any bug, report him on post a comment on the mod page : http://www.minecraftforum.net/topic/1128585-wip-ssp-the-freezer-would-you-like-to-see-the-inverse-of-the-nether-a-new-dimension-new-fire-new-water-and-mores/   