Instructions
Go to the "Cops and Robbers" page in the Planet Minecraft website (link in Resources).
Click the "Minecraft World Save" to open the download page in a new tab.
Click the "Skip Ad" button if you are redirected to an AdF.ly page. Click the "Download" button in the download page to download the "Cops and Robbers" ZIP file. Save the file to your desktop.
Open a Run dialog by holding the "Windows" key on your keyboard and pressing "R." In the Run dialog, enter "%AppData%\.minecraft\saves" in the text box and click the "OK" button to open your "Minecraft" saves folder.
Open the "Cops and Robbers" ZIP file you just downloaded to see its contents. Drag the "Cops and Robbers" folder with your left mouse button to the "Minecraft" saves folder you opened earlier. The next time you launch "Minecraft" the "Cops and Robbers" world will appear in the Select World screen.