It is documented in the README that a scrip needs to be run but details on the scrip and how to run are not included. The script will be in the location where you unpack the .tar installation file for the DA/DR.
Certification Migration Tool
Upgrading to a new version of Data Aggregator now requires users to run the certification migration tool, which is included in the installer package. The migration tool moves vendor and CAMM certifications and metric families to the appropriate directory.
Running the tool is fairly simple.
1.Stop the DA.
2. Run the tool on the DA.
./opt/IMDataAggregator/jre/bin/java -jar /<LOCATION_TO_TOOL>/camm-tools-cert-migration-2.4.0-RELEASE-123-jar-with-dependencies.jar
3. Restart the DA.
The certs should at this point be backed up, and then properly moved OUT of the deploy directory into the new certification folder structure.