
If you don’t already have any installation media for Windows 10, you’ll first need to create it. Step 3: Create Windows 10 Installation Media This safeguards all your documents in case there are any issues during the installation. It’s always worth backing up your files before doing a major system update or upgrade. Otherwise, you may need to contact Microsoft support to ask for a replacement. If you can’t find it lying around, one way to recover it is using one of the many “key finder” tools available online. Windows product keys are also stored in your computer’s ‘Registry’.

To take advantage of the free upgrade, however, you first need to have an authentic copy of Windows 7, 8, or 8.1 installed on your computer with a valid product key.

Describing it as a “universal app”, Windows 10 can be installed on multiple devices including PCs, tablets, and smartphones.

Product keyWhen Microsoft released Windows 10 in July 2015, it allowed existing Windows 7, 8, and 8.1 users to upgrade for free.
