All Editions of Mac OS X Official Ultra HD wallpapers collection, no watermark

For both Windows and Mac OS X, every system upgrade comes with many brand new and beautiful wallpapers. We do not want to open too many posts for Mac official wallpapers collection at AppNee, instead we will put any resource related to Mac wallpaper together, into one place! That is to say, as long as some resource is identified with 'Mac' and 'Wallpaper' these two keywords, then it will appear in this post.