Microsoft has blatantly started blocking Windows 10 upgrade for Windows Phone 8.1 users as per the reports that are coming in from multiple inputs.If you are carrying around a Windows Phone device which is running on Windows Phone 8.1 OS, and was eligible for the upgrade to Windows 10 during the initial launch, you may not be able to do it right now.

On Windows Phone 8.1? No more app store for you after Oct 16, 2019 Windows Phone 8.1 Review | Pocketnow - YouTube Apr 14, 2014

Upgrading existing Windows Phone 8.1 devices to Windows 10

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How To Upgrade Any Windows Phone 8.1 To Windows Phone 10

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