Instructions
Unpack the model download files you have selected and place them all in a convenient folder to keep them organized.
Open the "Warcraft III" Map Editor, click on "File" and select "Import" from the dropdown menu; this will bring up the import manager.
Select the model files you selected from Step 1 to import them into the editor.
Open the object editor and select "New" to create a new unit. Choose a model that you want to replace with your imported model, then click "Art - Model File" and click on the file you imported. This will replace the default model with your custom model.