Please do not spam the Jenkins open source mailing lists with questions specific to CloudBees products. The correct place to direct those issues is either
sup...@cloudbees.com (or perhaps the
us...@cloudbees.com mailing list but I think that is not really used now since the PaaS was dropped)
To try and answer your question... anyway
A version number with two segments is Jenkins OSS, e.g. 1.618 has two segments "1" and "618"
A version number with three segments is Jenkins LTS, e.g. 1.609.1 has three segments "1" followed by "609" followed by "1" again
A version number with four segments is based off the corresponding three segment version, so "1.609.1.1" is a build based on "1.609.1". Where somebody is providing builds based off the LTS line - for example CloudBees do this, but anyone could do the same - then they would use version numbers based on the version they build on, so the four segment "1.609.1.1" identifies a version that is not produced by the community.
So you are running Jenkins OSS.
For CJOC we mandate that you must have a license for all client masters and to connect a client master to CJOC you need to have the oc-client plugin installed. See
https://wiki.jenkins-ci.org/display/JENKINS/CloudBees+Jenkins+Enterprise for our open source plugin that will connect your instance to our proprietary update center so that you can download and install the required plugins (this is because the Jenkins community - who we respect - has decreed that closed source plugins are not allowed to be hosted on the community's update centers... so to get our closed source plugins you need to connect to our own update center)