What downsides do you mean? The FastSpring version actually runs faster/smoother due to me not having to use .net native compiler (which Microsoft forces for the Microsoft Store), it lets you control when to install updates as there is a prompt (versus automatic updates through the Microsoft Store) and it also can't be terminated in the background as I can request additional permissions that I can't request in the Microsoft Store version. The single and only benefit of the Microsoft Store version is you can install on multiple devices - that is it. The FastSpring version can also technically access files outside the storage location which is helpful when batch importing PDFs from a folder on the device, as it can pull in audio files automatically at the same time. In the Microsoft Store version, this is only supported if you import from within the storage location.
Mike
Mike