MacOS Big Sur build 20B5012d

macOS Big Sur build 20B5012d is the official Beta release of macOS Big Sur 11.0.1, which was released to Apple developers on 2020-10-28. This build adds 40 new wallpapers, which are the same ones that can be found in iOS 14.2 beta. It was also released as a public beta one day later on 2020-10-29.