But note that a key can only be used on one PC at a time, so if you use that key for a new PC build , any other PC running that key is out of luck. Downsides of Using an Old Key When using an older Windows key to activate Windows 10, you may run into complications if Microsoft isn't sure whether you're eligible to update or not. But that seems to be happening less in recent months and years. Don't Activate Windows: I have colleagues who have used non-activated versions of Windows for years without Microsoft ever shutting it down.
Medium-to-high effort: Try a Windows 7 or 8 key Microsoft Price: When Microsoft first launched Windows 10 back in , it offered Windows 7 and Windows 8 users a truly free, no-strings upgrade to the new operating system. The promotion was only available for just one year—presumably to accelerate push up Windows 10 adoption rates—and expired in July But even though Microsoft officially ended this program three years ago, it still has yet completely shut everything down. The activation servers have been allowing Windows 7 and 8 keys on some Windows 10 installs.
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Windows 10 Pro - $14 - How to Buy, Download, & Activate!