When you upgrade from the Windows 8.1 Preview release to Windows 8.1 General Availability on a Windows RT-based device, any deployed application that you may have had on the device is removed. This problem occurs because during the upgrade of a Windows RT-based device from the Windows 8.1 Preview release to Windows 8.1 General Availability, there is no "keep settings, files, and apps" option that you can select. This causes both management ability and deployed applications to be removed from the device.
For all the details for this issue as well as a resolution, please see the following:
KB2905780 - Deployed applications are removed during upgrade to Windows 8.1 General Availability on a Windows RT-based device (http://support.microsoft.com/kb/2905780)
J.C. Hornbeck| Solution Asset PM | Microsoft GBS Management and Security Division
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