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Windows 10 may still be free:
Here's how you can still get a free Windows 10 upgrade | ZDNet
Is Microsoft Still Secretly Running Offer? Windows 7 Copy Still Upgradeable
Update from W7 still FREE (May 2017) - Windows 10 Forums
April 2017 Update: Windows 10 Upgrade Still Free for Windows 7 and 8.1 PCs - 1redDrop