If you have a Windows 10 Pro product key. Select Start > Settings > Update & Security > Activation. Under Upgrade your edition of Windows, select Change product key. Enter the character Windows 10 Pro product key. Select Next to start the upgrade to Windows 10 Pro. If you don't have a Windows 10 Pro product key. Jun 27, · A) If you have not already, you will need to download a Windows 10 ISO file. B) In Windows 8, , or 10, mount the ISO file, and go to step 9 below. C) In Windows 7, you will need to extract the files in the ISO to a new folder on your desktop, open the folder, and go to .
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