Those wallpapers need the software “Wallpaper Engine” to run. You can get this excellent program for about 4 bucks on Steam: https://store.steampowered.com/app/431960/Wallpaper_Engine/
All wallpapers are rendered in resolution 4k (3840 x 2160), and are optimized for small size and some kind “calming movement”.
The download-links to the actual wallpapers are also links to Steam, but the wallpapers are completely free:
- Toy Country: https://steamcommunity.com/sharedfiles/filedetails/?id=1725174084
- Woodcut: https://steamcommunity.com/sharedfiles/filedetails/?id=1725154066
- Hive: https://steamcommunity.com/sharedfiles/filedetails/?id=1725171644
- Blood Rock: https://steamcommunity.com/sharedfiles/filedetails/?id=1725164691
- Electron: https://steamcommunity.com/sharedfiles/filedetails/?id=1692615806
- Mirror of Souls: https://steamcommunity.com/sharedfiles/filedetails/?id=1691471735
- Arrival: https://steamcommunity.com/sharedfiles/filedetails/?id=1685946527
- Dark Nebula: https://steamcommunity.com/sharedfiles/filedetails/?id=1657930551
- Hypnotic Rings: https://steamcommunity.com/sharedfiles/filedetails/?id=1575536916
- Pendulum: https://steamcommunity.com/sharedfiles/filedetails/?id=1582601770
You may also download a static version from the gallery below (in this case you will not need “Wallpaper Engine”):