I got the code on a PDF via email only 1. A retail license can be used to activate Windows on one system to another as you upgrade your hardware over time.
 
 

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If you are installing Windows 10 on a PC running Windows XP or Windows Vista, or if you need to create installation media to install Windows 10 on a different PC, see Using the tool to create installation media (USB flash drive, DVD, or ISO file) to install Windows 10 on a different PC section below. Volume License Key (if applicable) Windows 10 Multiple Activation Key (MAK) and/or Windows 10 Key Management Service (KMS) How do I get my key? Keys can be obtained from VLSC or by calling the Activation Call Center. The KMS and MAK keys are assigned; they will enable you to activate both Windows 10 Professional and Windows 10 Enterprise. Nov 30,  · To activate Windows 10 Pro, you need a Windows 10 Pro product key or digital license. If you have it, you go to Activation replace.me you click Change product key to enter a Windows 10 Pro product key. If Windows 10 was previously activated on your device, your copy of Windows 10 Pro will be activated automatically.