Media Creation Tool (MCT) for Windows 10 is a program to allow downloading of Windows 10 Setup for clean install to be created in USB Disk or generated as ISO image.
MCT requires administrator access.
When windows is logged in as standard user, running MCT with Run as administrator or Run as different user will fail with error 0x800704DD-0x90016 when it starts creating Windows Setup on USB Disk or ISO image.
The only solution is to Login Windows using Administrator Account.
You do not need to logoff your current user account, you can switch user to administrator account to perform MCT.
Once MCT creation is completed, logoff administrator account and login back to your user account.
Media Creation Tool for Windows 10