: The app cannot be downloaded from the Microsoft Store on Windows Phone 8.1 devices because the store service for that OS is deactivated.
Since the Upgrade Advisor is gone, you can still upgrade a compatible phone via the , which are available for free. Here is a general, non-technical overview of the process:
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OTC updater 8.1.0.0 (Over the cable updater) - Microsoft Q&A
You cannot download the official Upgrade Advisor app for free in 2025 because its exclusive distribution platform is gone: : The app cannot be downloaded from the
Even with the PC tool, your phone needs sufficient internal space. Uninstall heavy apps and clear your browser cache before starting. Final Thoughts: Is It Worth It?
Windows 10 Mobile Upgrade Advisor was the official tool released by Microsoft in 2016 to help users transition from Windows Phone 8.1 to Windows 10 Mobile. The Status Today April 2026 , the Upgrade Advisor app is no longer available for download from the official Microsoft Store. Store Closure: The Windows Phone 8.1 Store officially closed on December 16, 2019 This link or copies made by others cannot be deleted
Microsoft completely retired the Windows 10 Mobile Upgrade Advisor app and pulled it from the official marketplace. Additionally, the backend servers that the app used to validate devices and trigger updates have been shut down. ⚠️ Warning Regarding Third-Party Downloads
Windows 10 Mobile Upgrade Advisor was a free application designed by Microsoft to help users of eligible Windows Phone 8.1 devices transition to Windows 10 Mobile
: Extract the files onto a computer running Windows 10 or Windows 11.