The serial number is not required to download and install the application, purchased in App Store. All iOS applications including ABBYY applications which you purchase in App Store store are associated with your Apple ID.
ABBYY is the global leader in Content IQ for the enterprise. ABBYY’s solutions enable the new digital workforce with the necessary skills and understanding to make intelligent business decisions. Organizations choose ABBYY for the simplicity, extensibility and intelligence its solutions offer.