Abdul,
You have TWO options:
- Modify BI 4.2 upgrade and remove Tomcat from BI Platform. Then do manual install of Tomcat 7 and use WDEPLOY to manually deploy the WAR files.
- Leave default Tomcat 8 as is and change default port from 8080 to 8888. Then do manual install of Tomcat 7 in another c:\Tomcat folder using Port 8080. Once Tomcat 7 working properly use WDEPLOY to manually deploy WAR files on Tomcat7.
2nd options is better this way the built-in Tomcat 8 is there to help you for troubleshoot, if needed.
Regards,
Ajay