To install simply unzip the materials, models, sound, and script folders into your cstrike directory. If you want world models too, open the install world models folder and install to your cstrike folder as well but be warned that you may experience consistency errors. If you would like the laser beam being omitted from the LAM then open and extract the contents of the WithLaserBeam.rar to your cstrike folder. If you decide you no longer want the beam, just re-extract the materials folder from the main .rar.

IF YOU ARE HAVING CONSISTENCY ERRORS REMOVE ALL WORLD MODELS. If you are unsure which are world models navigate to your cstrike/models/weapons folder and delete all files which begin with w_smg_mac10 (there are 7). Although this will remove the world model from your game, it will fix any consistency issues you are having.