The bundle includes a universal build of the chktex binary. If you do not have chktex installed on your system already please give it a try and let me know if everything works OK running it from the Support/bin directory. Also if you have a ppc machine please try it. My old iMac died so I don't have a G4/G5 to try this out on anymore.
I just installed chktex on a ppc G4. It compiled fine and the command works great. Will let you know if any problems arise.
Best, Mark