Myget packages are not accesible

[Noranius]

I tried to compile the master branch of xBIM Xplorer. However, I face several errors complaining that packages are not found, e.g., (translated from German)

Error restoring the Nuget package for the project "Xbim.WinformsSample": The version "5.1.283-develop" of the package "Xbim.IO.MemoryModel" was not found.
(local Nuget Path) package "Xbim.IO.MemoryModel.5.1.283-develop" was not found at the source.
https://www.myget.org/F/xbim-master/api/v3/index.json package Xbim.IO.MemoryModel.5.1.283-develop"Xbim.IO.MemoryModel.5.1.283-develop" was not found at the source.
"https://www.myget.org/F/xbim-master/api/v3/index.json package" "Xbim.IO.MemoryModel.5.1.283-develop" was not found at the source.
(https://api.nuget.org/v3/index.json): "Xbim.IO.MemoryModel.5.1.283-develop" was not found at the source.

Can you provide some help, please?