* Version - Event Tickets Plus 5.7.6 is only compatible with Event Tickets 5.6.6 and higher.
* Fix - Ticket property invalidation to ensure capacity, inventory and availability are correctly invalidated. [ET-1887]
* Tweak - Make use of the QR Code library from Event Tickets to generate QR codes for tickets, instead of including one in Event Tickets Plus. [ETWP-29]
* Language - 3 new strings added, 25 updated, 0 fuzzied, and 1 obsoleted