Could not load file or assembly 'Microsoft.DNX.PackageManager' or one of its dependencies. The system cannot find the file specified

Could not load file or assembly 'System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Could not load file or assembly 'System.Web.Mvc, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

ASP.NET 5 uses the NuGet package manager to get server-side libraries but for client-side things we recommend folks use Bower. The most popular JavaScript and CSS libraries are there, and there's no need for us to duplicate them in NuGet. This means ASP.NET 5 folks get to use the same great client-side libraries that other open web technologies enjoy.

Install-Package : Could not connect to the feed specified at 'https://www.nuget.org/api/v2/'. Please verify that the package source 
(located in the Package Manager Settings) is valid and ensure your network connectivity.
At line:1 char:1
+ Install-Package EntityFramework
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

Blisk is a first developer-oriented browser. It provides businesses with a development workspace for the teams and freelancers to develop and test modern web applications twice faster.

The Trusted Platform Module (TPM) is a chip that is either integrated into your PC’s motherboard or added separately into the CPU. Its purpose is to help protect encryption keys, user credentials, and other sensitive data behind a hardware barrier so that malware and attackers can’t access or tamper with that data. 

We are happy to announce the availability of .NET 8, the latest LTS version of one of the world’s leading development platforms, starting today. .NET 8 delivers thousands of performance, stability, and security improvements, as well as platform and tooling enhancements that help increase developer productivity and speed of innovation