These maps and its custom textures are made by Supernova38 @deviantart.com. DO NOT reupload them anywere else without my permission. Thank you.
To install, simply extract were'ever you want and then drag the WAD files and folders into "C:\half life\valve." If you have Half life 1 on steam then drag and drop it here: "C:\program files\valve\steam\steamapps\your username\half life\valve." These maps aren't made to work with half life source, nor will they since half life source doesn't use goldsource.
Above is taken directly from the readme this .zip contains. I would like to add, though, that its greatly stressed that nobody is to tamper with these maps (you can use the textures, though) at all. I, unfortunately, get pretty paranoid about theft. So please respect that.