Urban Resonanace Is A Sandbox mod Make For Half life 2.requires source sdk 2013 singleplayer and half life 2.it needs source sdk 2013 singleplayer because it is made using that engine
New Mod For Half life 2.made using source sdk 2013 singleplayer.How to download 1st:extract .zip file 2.Put it in your sourcemods folder like C:\Program Files (x86)\Steam\steamapps\sourcemods. if sourcemods is not in your steam files create one name it sourcemods
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It goes to your sourcemods folder