Well MeV, the Requirements section of the description (in addition to the release notes included with the download) plainly states that REALbasic 5.5 is required. We don't know what else to tell you but it is a shame that you left a 1-star rating based on your misunderstanding of the system requirements.

Considering that REALbasic 4.5 was released around July 2002, you might want to consider upgrading. RB 5.5 has some great new features.