I upgraded the Windows Phone Silverlight 8 application to version 8.1. Now that some people update the application, they get error 80073cf9.
I checked other messages and they are all related to the Windows Store, not the Windows Phone Store. This is NOT a universal app!
Update MSDN Link Subject: http://social.msdn.microsoft.com/Forums/en-US/cc838fcc-7bd9-48af-b904-2506cd93db74/error-80073cf9-on-install?forum=winphoneappcompat
In many cases, it seemed that there were no icons or snippets in the application manifest. In my case, ProductID did not match. I introduced a new GUID and it seemed to work.
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ERROR CODE 80073cf9 Many applications (especially the main applications) require REGION and LOCATION to be correct in the settings. check them first before resetting the device! Then cancel and restart the download. Allow location when prompted. This worked for me after I apparently lost some settings after updating the SIM card. Dagster496
Just change the meaning of the storage "Store new applications o my" phone
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