If you are ever likely to want Windows 10 on any PC, then you should upgrade it before 29 July. This is true even if you don’t intend to use Windows 10 for a few years, if ever.
The key point is that each qualified PC has to register the Windows 10 upgrade online on Microsoft’s activation server by 29 July. The activation, not the code, is what makes the Windows 10 upgrade free. If you were to use exactly the same code on exactly the same PC a few days later, the activation would not be free.
The online activation procedure means you can’t usefully save Windows 10 upgrade code, or transfer an upgrade from a different laptop. (In fact, pre-installed copies of Windows are locked to a specific device, and can’t legally be moved to a different device.)
Windows 10’s online activation procedure creates a hash code based on your PC’s hardware, mainly the motherboard and processor. Microsoft stores this code for future reference. After that, you can upgrade to Windows 10 then roll back to Windows 7 as often as you like.
Windows 7 was launched in 2009 and will be supported until 2020, so you can keep using it until then. However, if you think you might want to use Windows 10 before 2020, or you plan to keep using your current PC through 2020 and beyond, then you should take the free upgrade while it’s available. The PC manufacturers, who are Microsoft’s real customers, would much rather sell you a new PC running Windows 10 than have Microsoft upgrade your old one.
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