Restart Windows
1. Restart your PC.
2. Load the operating system.

3. Reinstall the upgrade of the .NET Framework. You will no longer get the 1935 error message, the cause of which is removed after a restart.
Stop Windows Installer
4. Open the Control Panel.
5. Double-click 'Administrative Tools.'
6. Double-click 'Services.'
7. Right-click 'Windows Installer.'
8. Click 'Stop.' Now you won't receive the 1935 error when you upgrade the .NET Framework.