Very interesting case of subscription based desktop application, am I right? How do you manage things such as a person being offline, do you require the person to connect to the internet so that you can manage the subscription? How does your users react? Have you already started with a subscription-based approach?

Generally people will need to get online to get the latest version (which is necessary frequently to get newer browser versions). During this time the licence is also checked.

In my experience the customers expect a subscription based pricing especially with an application that required high-frequency updates (I release a new version once or twice a month).