Microsoft’s Edge Insider setup program uses an installer that connects to the Internet and downloads the full setup package for the Edge browser. While we are not currently able to install the Microsoft Edge Insider preview, we are able to get information such as how the installation will work, the current version of the preview build, and the names of the executables. We assume this is because it is currently blocked from being accessed publicly and only available to those on Microsoft’s network. We will be continuing to track Edge Insider’s development process and will release new information as it becomes available.
Source: https://www.bleepingcomputer.com/news/security/microsoft-edge-insider-closer-to-release-with-new-installers/