Upgrading to 3.0.0+ from pre-3.0.0 Release Versions
For version 3.0.0 we removed the need for the Last Comment value to be stored in the database. This greatly reduces the drag on the database as well as shrinking the amount of memory required to reindex the server. To install any 3.0.0+ release from a pre-3.0.0 version, we recommend you delete whatever field you are currently using to hold the last comment value (associated with the CCC Last Comment plugin) and then uninstall the pre-3.0.0 version.
After that just install the new version and create the Field you would like to use (We recommend using the name 'Last Comment' but in reality you could use any valid custom field name - i.e. 'Jane Says' would work just as well as long as the field's 'Type' is set to 'CCC Last Comment' (which now appears nearer the start of the custom field Types list).
Note: While a reindex is recommended after installing any pluging/creating a new custom field in this case it is not required unless you chose to use the Last Comment Searcher.