Fix: The .NET Framework 4.7 installation is blocked on Windows 10

1. Check windows pending update 

Open windows update manager and check pending windows update. if any pending updates install the updates and try again.

2. Windows Registry Editor

1. Tap on the Windows-key, type regedit.exe, and hit the Enter-key on the keyboard. This should start the Windows Registry Editor.
2. Go to the key: HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup\NDP
3. Right-click on NDP and select New > Key.
4. Name that key WU.
5. Right-click on WU, and select New > Dword (32-bit) Value.
6. Name it BlockNetFramework47.
7. Set its value to 1 (double-click it to set value).

3. System Requirements 

See detailed information on microsoft website