Getting ERROR: The wizard cannot continue because of the following error: could not load wizard specified in /wizard.inf (104)
Solution: Uninstall everything related with java and jre. Then, download the lastest version of jre for linux x86 or x64, rpm.bin one. And follow these instructions http://www.java.com/en/download/help/linux_install.xml "To install the Linux RPM (self-extracting) file".
Make a user and group informix (as root), then uncompress the (informix package).tar in /opt/informix that you have created. And tun ./ids_install, and GUI will work ok.
Hope it helps.