Block apps from being downloaded pc
Make sure the app is deployed to Cloud App Security; Create a block download policy for unmanaged devices. Cloud App Security session policies allow you to restrict a session based on device state. To accomplish control of a session using its device as a condition, create both a conditional access policy AND a session policy. How to block non-Store apps in the Windows 10 Creators Update you can download and install apps from anywhere, but the caveat is that getting apps from unknown sources can harm your computer