Thanks Mahesh for your response.
So I have already raised one media request regarding the same.Could you please clarify me one thing as I will be going for update only not a fresh installation so any specific jar/war available for this.
As you are going for the update process from v7.2.1 to v7.2.2 you need to follow the steps specified in the shared document of Sowjanya.
Basically you have to update your rules and data schema from 7.2.1 to 7.2.2 as explained in update document. This process can be done via Command Line/GUI.
Once the update of the rules and data schema is finished then you have to deploy the new prweb war/ear files from 7.2.2 media into the server, then you need to configure the updated rules/data schemas of 7.2.2 in the data source configuration.
I had explained you at the high level process to be followed and for the detailed steps kindly look into the shared update document for better understanding.
The subject of your post specifies upgrade and message talks about update. If you are looking for upgrade specific then you can look into this document. If it is update then you can follow the document specified by Sowjenya. Hope this might be helpful to you.