Upgrading to 18.104.22.168 is only supported from 22.214.171.124 or later. If you are running a version older than 126.96.36.199, you must first upgrade to 188.8.131.52 or later before upgrading to 184.108.40.206. For customers running on a release earlier than 220.127.116.11 and needing to upgrade to 18.104.22.168 or higher, please contact Delphix support to help coordinate this upgrade.
22.214.171.124 is the last version that can be directly upgraded to, from 126.96.36.199-188.8.131.52.
If you are upgrading from a version < 184.108.40.206 before you begin the upgrade process, contact Delphix Support to perform some pre-checks.