Free Download Bookly Chain Appointments (Add-on) v2.1 Nulled. This is the latest version which was last updated on February 12, 2021. Download Bookly Chain Appointments (Add-on) v2.1. Important: This plugin is an add-on that requires the Bookly PRO installed and activated. View Bookly PRO page at Codecanyon. Let your clients book several services for single visit with the Chain Appointments add-on. The clients will be able to choose multiple services from different service providers at the first step of booking process.