Standard Windows backgrounds can't play animated "packs" on their own. You first need one of these tools:
Downloading a usually involves two steps: getting a "player" app (like Lively Wallpaper or Wallpaper Engine ) and then downloading the wallpaper files (often in .mp4 or .mlw formats) to put inside it. 1. Essential Tools (The "Players") Download Gaming Live Wallpaper Pack zip
Once your player is installed, you can download packs or individual files from these sources: Lively Wallpaper - Download Standard Windows backgrounds can't play animated "packs" on