Having trouble with Minecraft texturepacks?

I've been trying to install the Sphax PureBD Craft texture pack, and I have put the file where it should be, yet it doesn't work. No idea what else to do, so any help is appreciated.

Screenshot to clarify a bit -

You have to enable the resource pack manually in-game before you will see its textures.

While Minecraft is running, go to 'Options', then select 'Resource Packs'. From the category 'Available Resource Packs', select Sphax PureBDcraft - this will move it over to 'Selected Resource Packs'. Click Done.

Depending on which pack you chose, it could take up to a minute or more for it to load in the textures properly. Once complete, it will return you to the options interface and Sphax will now be active. Load up a game or join a server to confirm it's working.