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by benaadams 3563 days ago
You don't need to buy a signing cert; the Store signs the appx for you for installation. (Though you sign or self-sign the package https://msdn.microsoft.com/en-us/library/windows/desktop/hh4...)

You may need to buy one if you distribute the appx outside the store and you want it to be automatically trusted? (As you don't need to distribute the appx via the Store or install via the Store)