Download it, and extract the files into a folder.
Make sure that the skin(s) are in .blp format.
Step 2: The Import Manager
Click on the Import Manager (F12) in the tool tip menu.
(The tooltip menu)
(Import Manager Icon)
Then click on File, Import File (Ctrl+I) or Import Files (Ctrl+Shift+I) if you want to import more then one file.
NOTE – You can also click on the icon shown within the import manager to import a file.
(Import File (Ctrl+I))
Step 3: Import the Skin
Then browse through your files and find the skin you want to import.
Step 4: Custom Paths
You will probably notice that the imported file show a path like
This is incorrect and you need to edit it.
NOTE - Paths are usually different depending on the creator, the creator of a model or a skin chooses the path which the model/skin needs in order to work probably.
To edit a path of an imported file you double click the imported file and then check/enable the "Use custom path" checkbox. Now enter the correct path.
The path for this skin is Textures\MountainGiant.blp
NOTE – Usually creators write the paths for the models/skins so people know what path they should use so they don’t have to try all kinds of paths.
After you’ve entered the correct path, click on OK.
Step 5: Save the Map and close it.
NOTE - You could also change the Preferences of the editor, click File - preferences - Video - change detail of models and textures, click ok, reset these settings. This will force Warcraft to reload all the models and textures.
Step 6: Open the Map
Your skin should now appear in game.
Since this skin is based on The Mountain Giant the skin can be found at the Art – Model File under the Mountain Giant, notice that the model now uses a new skin.
If you can’t see the skin, try place the unit on the map.
If it doesn’t appear there, it’s either bugged or else the custom path is wrong.