I just purchased the Windows 10 app from the store. I've read the FAQ, but only after discovering that I paid for an app that is fundamentally not compatible with other Apps for join because it is not just missing functionality which the extensions have, but it is missing functionality that prevents it from working with those apps, making it totally useless. I don't know what encryption library you're using, but saying that it doesn't exist on Windows doesn't seem like a good reason to simply not support a feature that breaks compatibility with the other apps. There are plenty of freely available, cross platform encryption libraries that you could use. Would it be possible to get a refund? I'll happily buy it again once you implement encryption such that the app can function alongside the browser extensions.