The ClarisWorks HyperTour has been tested with all versions of HyperCard from 1.2.5 through 2.1. The minimum memory requirement for HyperCard is 750K, and if the user has manually decreased this, they will receive a message that more memory is needed.
Solution: Increase HyperCard's memory allocation in the Get Info window or under System 6, make more memory available to HyperCard by turning off extensions or turning off MultiFinder.