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how do i configure it as a package that will be installed to my application's folder?
UWP can't install add-ons like the way you mentioned. There is one way to do this in UWP app. You need to put all the code in the UWP app. For example, you must implement the skins in your UWP app, your app has two different skins at the same time. But you just show the old skin and the new skin is not loaded. Until the customer purchased the add-on, you could check the purchase in your app and unlock the new skin and show it.
Thank you.
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