Banshee received seven updates, depending on the quantity of details you remember, it will help choose from the following:
The one on May 31, 2012 was adding two Banshee tiers 34 and 45, seven <adjective> Banshee tiers from 46 to 70, the one on July 13 was adding seven <adjective> Banshee tiers from 11 to 135, it potentially corresponds to Overlord, Twilight and Gatekeeper update on July 12.
The one on October 28, 2012 was adding Spirited Banshee tier 143, it potentially corresponds to Communicant on August 24 and Taladosian on October 5th.
The one on Feburary 7, 2015 was a <adjective> Banshee graphics update that has a five month gap from Llyr's Druid on October 6, 2014.
The one on January 13, 2017 was a <adjective> Banshee graphics update and the one on January 14, 2017 was a Banshee Messenger graphics update, it potentially corresponds to Ice Cream Crusader on September 3, 2016 and Angel of Souls on April 6, 2017.
The one on December 1, 2017 was a Banshee Messenger graphics update, it potentially corresponds to Mecha Knight Powersuit on September 1, 2017.