How to publish a Windows 8.1 store app to cover the old version for Windows 8 app

Hi, 
We need to publish a Windows 8.1 store app which is a Universal app, and there has have a Windows 8 app in store , we completely rewrite the application and now we hope user can upgrade it from old version other than install a new one. We plan to emulate
the updating process but didn't find any methods.
do you have any ideas about this?
Thanks.

Hi,
The scenario of the Windows 8/8.1 app is that- (VS=Visual Studio)
-If the app is build in VS2012 in Windows 8 then it will available for both Windows 8 and Windows 8.1 users
-If the app is build in VS2013 in Windows 8.1 then it will available only for Windows 8.1 users only.
You can use the Visual Studio 2013 Express (free available) in Windows 8.1 and retarget the old Windows 8 app to Windows 8.1 by following this link
https://msdn.microsoft.com/en-us/library/windows/apps/dn263114.aspx?f=255&MSPPError=-2147217396
The user will now get-
-Windows 8.1 app if running Windows 8.1
-Windows 8 app if running Windows 8
Basically if you want to develop/give updates simultaneously to users then use VS2012 and VS2013 on Windows 8.1 and work on both to have universal apps.

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