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Product code for Win 10 Clean reinstall after upgrade
I have downloaded the Windows 10 Pro ISO file from MS and burnt it to a DVD.
It offers to install it as an upgrade over my Win 8.1 Pro installation on my PC.
Once I have done this, can I then format the hard drive, and do a clean installation of Win 10 on the same machine without a product code?
I'm assuming the product code will be installed in the BIOS and not needed to be put in manually?
Can anyone confirm that I have correctly understood how it works?