i go to gmod steam workshop and subscribe the horror map. Then i open gmod and it downloads the map. When it finished downloading. I dont know where the map is. Can you show me the location of downloaded map.
start a new game and you should get a list of maps to select. there are some settings you can configure (Not recommended, advanced users only). If not maybe your map is corrupted and need to reinstall it, you can download it manually and place it. If none of the above work reinstall gmod.