I’ve checked all of the wayback machine files I can find, all the PT5/6 files have the same created/modified date unless there is one from an earlier date than March 14, 2006.

All the MIX supported plugins do work except H3000 Factory.

The issue presents itself on both OS9 and OSX 10.3.7 running Pro Tools MIX TDM. I would have ruled it an OS9 issue until it manifested the same way on OSX. Believe the solution was an NFR ilok asset that allowed for running an older H3000 plugin (possibly the one from the Massivepack or Anthology 1.0). Everything is working on PTHD 8 on my HD rig but would like to have it working on the MIX system on either OS9 or OSX since it was supported there.