Net Framework 4.7 2 Offline Link -

Microsoft hosts these files officially. To ensure security, always download directly from Microsoft’s servers rather than third-party software repositories.

Note: Windows 10 April 2018 Update (Version 1803) and later versions usually come with .NET 4.7.2 or higher pre-installed. How to Download and Install Step 1: Download net framework 4.7 2 offline

If you are an IT admin, you don't want to download the same 60MB–80MB file for 50 different machines. You download the offline installer once and deploy it via USB or a local network. Microsoft hosts these files officially

This is a security trust issue.