For people who are having problems, it installs to the wrong folder, go to steamapps/common/half-life 2/hl2 and copy the folder maps, then paste it into steamapps/(Username)/half-life 2/hl2.
Afterwards, open half-life 2 and open the console and type changelevel nightmare_house1.
The shortcut that is created is also broken, it can be fixed but its faster just to launch half-life 2 and load the map ingame.
atgod88
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