We are unable in finding the source code of the OpenPages 8.3 main software

Hello, we are installing IBM openpages 8.3 as a POC for our costomer.
Our work:-
in prerequisit we installed
1) Websphere Application Server v 9.0.5 ( admin console is accessible) and successfully make connectivity with Db2 database
2) install server ( admin console is accessible)
3) Db2 Advance Edition 11.5.0
4) cognos bi server

Problem:- we are stucked in installing openpages 8.3 main software. (through terminal as well as through install server)