Microsoft doesn’t want you to install apps which are not from its own Windows Store. The company is reportedly set to release a new Windows 10 Creators Update which will include a new feature that will allow blocking of app installation if it is not from the official store.
Article Link: http://www.bgr.in/news/windows-10-creators-update-will-let-you-block-apps-which-are-not-from-official-app-store/