Help with SphaxPureBDcraft

[Shickley]

I am trying to install Sphax into Tekkit Classic. I have followed the tutorials on Youtube as well as on other websites. It said to download Sphax for tekkit and the normal minecraft, and to then merge the to using winrar. I followed the instructions, and ended up having to extract the files for it to even show up in minecraft as a texture pack. It shows the same picture as default and has the same description. I am not sure what I am doing wrong, and any help would be greatly appreciated.