This refers to the vertical resolution: 480 pixels tall (standard definition, similar to DVD quality).
Users on Reddit (r/Piracy, r/TerraNova) and various tech forums have reported that any file linked to "Harrylala" or requiring an "install" for a video is 100% fraudulent. It has no connection to the actual Terra Nova series. terra nova season 1 complete 480p web dl harrylala install
Even in an era of 4K streaming, SD releases have an audience: This refers to the vertical resolution: 480 pixels
Web-DL (Web Download) means the video is ripped directly from a streaming service (like Amazon Prime, Netflix, or Hulu—where Terra Nova has been available) without re-encoding from a broadcast source. Web-DLs are generally superior to "HDTV" rips because they have no network logos, no commercial breaks, and consistent bitrate. no commercial breaks