Gordon G-man addon - Half-Life

To use this model; open your steam library and go to Half-Life. Once you are there, right click the Half-Life tab, move your mouse to "manage" and click on "browse local files". Once there, create a folder called "valve_addon".
Than, place the "models" folder in there. To enable the models, open Half-Life, go to the options menu, click on video, than click the box that reads "Allow custom addon content".

Thanks and have fun :)