Install IBM RTC InstallManager ERROR in linux CentOS release 6.8
One answer
Installation Manager is based on Eclipse and you can just treat the issue as an Eclipse issue. You can find plenty of similar issues reported in the past.
https://serverfault.com/questions/706446/can-not-install-ibm-installation-manager-on-centos-6-5
https://jazz.net/forum/questions/230524/error-java-was-started-but-returned-exit-code13-while-opening-rtc-client
https://stackoverflow.com/questions/4945178/cannot-run-eclipse-jvm-terminated-exit-code-13
https://stackoverflow.com/questions/9635506/error-starting-eclipse-in-linux-jvm-terminated-exit-code-13
https://www.techwalla.com/articles/how-to-fix-a-quotjvm-terminated-exit-code13quot-error-in-eclipse
Exit code 13 appears to indicate an incorrect version of Java so you may try to switch to other versions of Java (if available) on the system and see if any of them works for you.