If you cannot access the link, developers in the community recommend checking MSDN subscriptions or using Visual Studio Dev Essentials to download the full VS 2015 ISO, which contains the Isolated Shell component.
Historically, this shell was a centerpiece for developers who wanted to build their own custom IDEs or specialized tools without requiring users to install the full Visual Studio suite. It provided the core "frame" of the environment—the menus, windowing system, and basic editor—allowing developers to "plug in" their own languages or features. Current Availability and Access
The Microsoft Visual Studio 2015 Shell (Isolated) allows developers to build custom standalone applications on top of the Visual Studio IDE infrastructure without requiring users to have a full version of Visual Studio installed Visual Studio Download and Access
You can find the shell listed on the Visual Studio Isolated Shell page. However, this page often redirects users to log in or join a program first.
