On a case-sensitive filesystem (ie Linux) there are some errors in the naming of classes in the registration demo. The workaround was to use symlinks. The quiz has some kind of error as well on the final step.
Had the same problem finding it myself, took forever. Until it’s creator’s site returns you can now find a copy on scribd. It seems to be for the current version of the extension, although not 100% on that, haven’t noticed any issues, and something is much better than nothing.
A search on scribd for "yii behavior wizard" will turn it up.