Method 2: Turn off App Recommendations via Group Policy If the “Choose where to get apps” drop-down list is grayed out or missing, try to adjust the app installation policy using one of the following methods. Method 1: Turn off App Recommendations via Settings To get rid of the warning “ The app you’re trying to install isn’t a Microsoft-verified app“, here are 3 methods to turn off app recommendations in Windows 10.
Starting with Windows 10 build 15042, Microsoft has added a new setting which allows installing apps from Windows Store only. When you try to install an app or program in Windows 10, you may get the warning “ The app you’re trying to install isn’t a Microsoft-verified app“.