You mean they were trying to install the OS 9.2.2 updater on OS7/8? Of course that's not going to work, they are updaters, not OSes. That would be like downloading the XP Service Pack 2 update and trying to install it on Windows 98, thinking that would give you Windows XP! You of course need the full version of Windows XP to do that, not just the Service Pack.
The update path for OS 9 is 9.0.x (any version) > 9.1 > 9.2.1 > 9.2.2 - updates must be installed in that order, you can't just go straight to 9.2.2 using that updater from 9.0.4, for instance. As you have 9.2.1 (presumably already installed from the CD), 9.2.2 is the final one in the sequence to get the latest revision of OS 9, so if you get the right 9.2.2 update for your copy of 9 it should work.