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LEAP (LearnDash Essential Add-Ons Pack) consists of 5 plugins which are – WISDM Instructor Role for LearnDash; WISDM Group Registration for LearnDash; WISDM Ratings and Reviews for LearnDash; WISDM Quiz Reporting Extension; WISDM Content Cloner.
All these combine to give you a Superior LearnDash LMS.
Yes, you can upgrade to LEAP by paying the difference amount. i.e. Price of License you wish to Upgrade to -(subtract) The cost you have paid for the plugin.