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#11
Win 10 iso's are freely downloadable. See the tutorial section - search for 'iso' about the 5th or 6th.
A general search for
download "windows 10" iso
also works.
Useful for some non-booting situations e.g. startup repair, system restore etc..
There's also a link in the in-place upgrade tutorial:
A) If you have not already, you will need to download a Windows 10 ISO file.