It seems the following file in the Archive is corrupted:
http://www.nextcomputers.org/NeXTfiles/Software/NEXTSTEP/Apps/Lighthouse_Design/Concurrence/OmniImageFilter.pkg.tarI downloaded the file first directely from NeXTSTEP 3.3 and then also from Windows. Both files generated error messages when I tried to extract them in NeXTSTEP.