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I am sorry to report, but Microsoft stopped offering the free upgrade to Windows 10. As you mentioned the only way to get Windows 10 now is to purchase a license from Microsoft, which can be done on the page that follows.
Purchase Windows 10: https://www.microsoftstore.com/store/msusa/en_US/pdp/Windows-10-Home/productID.319937100?icid=All_WindowsCat_0518
In short, if you really wish to install Windows 10, you will have to pay Microsoft for a license. I wish there was some other way because a lot of people are facing the same issue as you.
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