How to debug migration from Windows Phone 8 to UWP

I'm working on UWP version of the application which currently in the Store but for Windows Phone 8. The WP8 version have some local data which I need to convert to new format when UWP version starting. How can I debug that process ? I've tried to associate UWP version with same store app name and then deployed package on the device where WP8 version was. But new version has not replaced old one. I see one way: create fake app in the store, upload old package, install on device, then upload new package and update. But it too painfull...

Solution

You need to copy ProdictId from old WMAppManifest.xml to PhoneProductId in new Package.appxmanifest. After that new UWP package replaces old WP8 one. And yes, files in local storage were created with old WP8 Silverlight app will be accessible from UWP app.

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