Required - Realty Core
Realty Core is new in Realty 3.0. It bundles all theme functionality and ensures data portability. Important in case you chsould ever switch themes or create your own without losing any data.
Plugins “Realty – Membership and Invoices” and “Realty – Custom Post Types And Taxonomies” have been merged into the new Realty Core. Therefor those two plugins are now obsolete and are be deactivated automatically when activating Realty Core. You can delete those two plugins.