In what cases do I need to purchase the Remote Access add-on separately?

The main purpose of the Remote Access add-on is to make sure that members who purchase access to a membership level through your Easy Digital Downloads store will be registered to your membership site properly (both new and existing members). When purchasing the External Membership Sites Add-Ons Bundle you get 1 license of the Remote Access add-on for 1 membership site installation. If you are selling through your Easy Digital Downloads website access to levels in one membership site only then you do not need to purchase any more licenses for the Remote Access add-on. If you are selling through your Easy Digital Downloads website access to levels in multiple membership sites then you need a license for every membership site you own.