Changelog
What's new comes with the update.
What changes in each version is written up in its release notes, in French, and you read them where you install the update: in your WordPress.
Where to read what a version changes. In your WordPress dashboard, when the update is offered to you: the “View version details” link opens the full notes, written in French. It's the official source, and the same as the one in the WordPress plugin directory.
This page will pull in those same notes, from that single source, rather than keep a second copy. Two changelogs written separately always end up contradicting each other, and it's the one the customer reads that looks wrong. Until that link is in place, we'd rather send you to the source than copy it out.
Updates are included, always.
For as long as your subscription runs, at no extra cost and with no “major” version to buy again.