For now, it would be best not to worry about it. WebObjects 5.0 doesn't work with 10.1 anyway, and the one that worked with 10.0.x has already expired.
An update which should be compatible with 10.1 is supposedly coming soon. When it does, I'd imagine that an updates demo will come too. However, be forewarned, WebObjects is still some 60 megs even without the full developer demo.