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I've now clicked the "Get windows 10" button on the taskbar of my Windows 7 Home Premium installation, and gotten the email confirming I'm eligible for a free Windows 10 upgrade. The instructions says I'll need the License Key if I'm doing a "first time installation":
If you will be installing the operating system for the first time, you will need your Windows product key (xxxxx-xxxxx-xxxxx-xxxxx-xxxxx). For more information about product keys and when they are required, visit the FAQ page.
Even though I proceeded to read the FAQ, it's not perfectly clear to me if the product key on a sticker of my old Windows 7 box can be used on a clean Windows 10 installation, or if I'll receive a new license key some time during the installation. Anyone know this?
As far as i know the old license keys won't work on the 10 install. I read about, that if you upgraded your windows through windows update the 10 will become already activated then you will have a key to the 10 but until that... – Shapperd – 2015-07-30T06:42:48.490