.NET Desktop Runtime 5.0.17 (x64) en You do not have the permissions required to install the .NET Desktop Runtime 5.0. Please contact your administrator. Installation of the .NET Desktop Runtime 5.0 (x64) is supported only on x64 machines. A failure occurred attempting to install the .NET Desktop Runtime 5.0. Installation of the Microsoft .NET Desktop Runtime 5.0 is not supported on this operating system.