After you get your installer-issues right and still get the same error....

The Tutorials seem to be simply wrong, probably because they were created for an older version of poser.

The poser-2010 installer creates .../Runtime/Libraries/Character/Poser 6/Jessi/...

While the tutorial-files try to load .../Runtime/Libraries/Character/Jessi/...

So there is an additional directory 'Poser 6' in the path, that the tutorials are not aware of. Therefore i would just copy the Jessi-folder on directory up in the hierarchy. The compression (jessi.obz vs jessi.obj) seems not to be a problem for poser.

My information is based on the dvd-version, however, the download-version could behave differently (but i guess it does not).