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Calc Pro, a basic MATLAB programming app, I had installed on my phone a couple of months ago. Now it is not available in store as I receive error message code 1 when I tap on the app in My Library in store.Now I want to reset my phone and don't want to lose the app. Is there any way I can back up the app somewhere and retrieve it from overthere later on? I am running 14393.479 on Lumia 535. The app is no more on the store nor I have any xap of it.