Version 220.127.116.1181 was re-released in February 2020 and is the current and last V6 production release. See this link for V7 release notes.
Version 18.104.22.16812 was released in December 2019 and has been succeeded by the 22.214.171.12481 version.
Before installing this version, your Tricerat Licensing Server must be upgraded to v5.2.1 or later! The upgrade to v5.2.1 Tricerat Licensing Server needs to be completed before upgrading any server component to avoid license checkout issues! See this page for upgrade instructions: Upgrading Your License Server The latest version is v5.2.1.