Hence don't make use of "Media Creation Tool for Windows 10", but instead directly download Windows 10 which released on 29th July from here:
English-US
- Windows 10 Home
- Windows 10 Pro
The links given above are same file which will be downloaded by Media Creation Tool, but from here you can download it with any downloading software of your choice.
VERY IMPORTANT: These downloaded files are in .ESD format, so you later on would have convert these .ESD files to .ISO:
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