He's using a shader mod, not a texture pack.
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Download the texture pack and put it into the Minecraft Texture Pack folder.
The Texture Pack they use is the Tekit version of Sphax 1.5 texture pack.
He used the GLSL shader,Flows hd texture pack,and Modern hd texture pack.
Faithful Venom Texture Pack
You can. First go to a texture pack website. Then click download. Go to the Minecraft folder and then find the Texture Pack file. Lastly drag the texture pack into the file and restart the game.