ComputerCreate Model is a resource pack. Nothing changes in your world until you activate it, and it only changes how CC: Tweaked blocks look.
Turning the pack on
1. From the title screen or the pause menu, open Options > Resource Packs.
2. Click Open Pack Folder and place the pack file in the folder that opens.
3. Go back to the Resource Packs screen. The pack appears in the Available list. Click it to move it into Selected.
4. If you run other packs that also retexture CC: Tweaked, move ComputerCreate Model above them. Packs higher in the Selected list override the ones below.
5.
Checking that it worked
1. Place a CC: Tweaked Computer or Turtle in your world.
2. Look at its casing. It should show brass, copper and wooden styling with cogwheel details instead of the default tech look.
3. Turn the machine on. Active parts should show moving texture frames.
If the blocks still look like stock CC: Tweaked, the pack is either not in Selected or another pack is overriding it. Fix the order and press F3 + T to reload resources without restarting.
If the textures change but nothing moves, your setup may not be showing animated textures. The pack requires a Minecraft version that supports them. Also check that any performance mod or OptiFine animation setting has texture animations turned on.