Thanks for your reply. I have solved this problem after I install K-Lite Codec Pack. You are really kind and your works are so beautiful. I fell calm when I watch this wallpaper at night.

If you get black screen using any of my Apple 4K wallpapers, that means your computer is missing the required Codec to playback the wallpaper properly. Just install K-Lite Codec Pack (any version), and it will install the required codec to playback the wallpaper.

hello, It doesn't work after subscription. Do you have any clues to solve it?