HTML Kit site requirements.

HTML editor / FAQ
HomeHTML-Kit downloadsAdd-ins that update and extend HTML-Kit's capabilitiesSoftware and authoring support channelsRegister -- download add-ons and support HTML-KitOnline tools for HTML-Kit users
  Translations of this page: in het Nederlands

Are there extra features in plugins downloaded using Download+?

No, there's no difference between the plugins download using the regular download method and plugins downloaded using Download+.