For those considering to upgrade to Retain 23.2, please note the following:
Your current Retain environment must be running version 4.11 or 184.108.40.206. In most cases, if you are running 4.11, you have probably updated to 220.127.116.11. In addition to running 4.11 or 18.104.22.168, the Active Index Engine must be Solr 8 and the Solr 7 index will need to be "cleaned up". As part of its install criteria, Retain 23.2 will check to see if Solr 8 is the Active Index Engine and it will also look for any evidence of Solr 7. Please refer to the Retain 4.11 documentation regarding the process to update your index from Solr 7 to Solr 8.