Here is my experience:
Downloaded full update package.
While installing I recieved a check sum error on one of
the files. I aborted the install. Poser5 would not run
after that.

Uninstalled poser5. Reinstalled Poser5. Downloaded the
separate content and program zips. Installed these files.
Now I get this while running: Caught C exception access_violation trapped at 1b:af27c4. Crash.

Man, is this fun.