Source Media Arcade is an all-in-one media center experience for your PC. Shortcuts to your files, games, and movies appear as full-sized arcade cabinets, hand-held tablets, or mounted view screens. You access your media items simply by walking up to them and pressing the USE key. In version 2, you are able to play in MULTIPLAYER mode where your friends can come join in on the fun.
Just put the ZIP files of the addon into your smarcade2/addons folder. No matter what Source engine game the addon content was designed for, Source Media Arcade will automatically install its resources the next time you launch the mod.
Alternatively, you could install the content folders yourself and run the "scanmaps" and "scanmodels" console commands to generate Library Items for your newly added resources.