Oct 16, 2019

Open the app and check the box that reads "Enable Preview for Developers." To download the Windows Phone 8.1 update, go to the phone's settings, scroll down to phone update, and check for updates. How to upgrade Windows Phone 8.1 to Windows 10 Mobile Mar 18, 2016 How to Upgrade Windows Phone 8.1 to Windows 10 Mobile

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Microsoft releases a new tool to update your Windows Phones Oct 22, 2017 Phone Update on Windows Phone 8.1 - Windows Central Forums

Upgrade to Windows 10: FAQ - Windows Help

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