This release includes CAT v27.xx and PFV v27.xx.
To Upgrading to version 6 can only be done from version 5.
So, to upgrade from version 4 you must first upgrade to version 5 and then to version 6
Additionally, to upgrade from version 2.1 to version 6, you must first upgrade to version 4, then to version 5 and then to version 6.
Please contact firstname.lastname@example.org if you require assistance to do this.