Thought I would post the solution I found to the non-operating installer for Myst IV (which I also found to be the case for Myst V).
In Tiger 10.4.11 with all Software Updates added to the hard drive, there are 9 releases of Java. On the Myst IV and Myst V DVDs, there are two invisible files named "mac.command" and "macinstall.jar" which are used by the "Myst IV Setup.app" that was dragged to the hard drive. I looked at the Console log after double-clicking on "Myst IV Setup" and saw "cannot find /wizard.xml" as the last line. So I tried to open "mac.command" and got the same thing. Using JAR Launcher to try and open "macinstall.jar" I got the error message that it was "incomplete or corrupt." Remember, this is on the Cyan Worlds DVD!
Eventually I did an Archive and Install using my original Apple Tiger Install Disc 1. This installed Mac OS X 10.4 on my hard disk (and the corresponding version of Java). Immediately after that, I installed both Myst IV and Myst V, and the installation went perfectly.
At this point I also installed the Myst IV 1.0 ->1.03 patch for Mac (also a ".jar" file) which worked perfectly and gave the "1.03" script at the lower left corner of the Myst IV splash screen. (I had previously tried updating with that patch back when I did have Myst IV 1.0 installed, but under Mac OS X 10.4.11 that update would not run either.)
After the successful installation of Myst IV and Myst V and the Myst IV patch, I used Software Update to bring the OS up to 10.4.11, and all the Java stuff up to Release 9. The games play perfectly; I just cannot install them at this level of OS X/Java. My guess is that Java's latest (or maybe somewhat earlier) release lost compatibility with the "InstallShield" program used by Cyan Worlds for Myst IV and V.