The GA version available from 'Release and Support Lifecycle' for CA Chorus Software Manager is 6.0.
However checking the documentation library for CA CSM, there is only release 6.1
CA Chorus Software Manager Release and Support Lifecycle Dates
CA Chorus Software Manager 6.1
CSM 6.0 - z/OS supported releases -
CSM 6.0 is the only release available for download.
Both CSM 6.0 and 6.1 has regular maintenance shipments.
Running either CSM 6.0 and 6.1 with the current maintenance ensure both releases share common features.