Microsoft rolling out another August cumulative update (KB4512941) for Windows 10 version 1903 that includes numerous fixes. This update won’t download and install automatically unless the user manually checks for updates in the Settings app. It also includes improvements for the user experience and app compatibility so that more Win32 apps will work with Windows Mixed Reality. Another bug has been fixed which was causing problems when downloading copyrighted digital media (music, TV shows, movies, movies) from certain websites in Microsoft Edge and Internet Explorer.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-v1903-update-kb4512941-released-with-sandbox-fix-and-more/