Try disabling the VPN while you download and install the Windows 10 Fall Creators Update.If you have antivirus software installed, try disabling that while installing as well, as that may fix the problem.However, some people have encountered problems when using it.If the Media Creation Tool becomes stuck when trying to download the Windows 10 Fall Creators Update files, try closing then restarting the Media Creation Tool app, and instructions.
The Media Creation Tool is a handy app made by Microsoft that allows you to install the Windows 10 Fall Creators Update using a USB drive or DVD.
Select the language, edition and 32-bit or 64-bit version, then select either ‘USB flash drive’ or ‘ISO file’, depending on whether you’re installing from a USB drive or from a DVD (select ISO file for this).
Once the tool has formatted and created the installation drive, you can restart your PC, boot from the drive and install the Windows 10 Fall Creators Update from scratch.
Also, Microsoft has unleashed a new update, called the April 2018 Update, and we've put together another guide on how to fix Windows 10 April 2018 Update problems.
Unfortunately, it’s a fact of life that immediately after the release of a major operating system update some things go wrong.