In this document, I have completed step 5 which is de-configuring Oracle Restart. All smooth.
The problem starts here. Next step 6 says
Prepare the server for Oracle Clusterware configuration, as described in this document. In addition, choose if you want to install Oracle Grid Infrastructure for a Cluster in the same location as Oracle Restart, or in a different location:
You would have noticed that there's a note which says that the process uses config wizard which is available with rel 220.127.116.11 or later. Mine's 18.104.22.168.
From the doc
This procedure uses Oracle Clusterware Configuration Wizard, available with release 22.214.171.124 and later.
So how do I proceed from here? Can the existing binaries be used? If yes, how? Can't find much information. Thanks for your valuable time.