We are using Oracle VirtualBox with pre-configured SOA Suite 12.2.1 VirtualBox VM

i'm just confused with the features which were included in OSA (Oracle Stream Analytics).
What is the difference between these two versions?
I could see exactly the documentation related to my version is here
https://docs.oracle.com/middleware/1221/osa/using-streamanalytics/GUID-81454309-164B-4933-B972-A9FEF06159D0.htm#OEPSX117
But, This also the latest version documentation for OSA.
https://docs.oracle.com/en/middleware/osa/18.1/understanding-stream-analytics/index.html
many of the features were not included in this version.
did i need to get any other version installation.?