Please check what versions of Mac OS X and QuickTime you are using.
The minimum requirements for Modul8 1.0 are Mac OS X 10.3 and QuickTime 6.5.
For Modul8 2.5.8 and up the minimum requirements are Mac OS X 10.4.11.
If Modul8 still does not work, check that the python framework is installed in your system (it should be in /system/library/frameworks). Normally the MacOS X 10.3 comes with Python pre-installed, however you may have deleted it.
Modul8 requires also that the BSD sub-system is enabled. See the support forum for details.
See the following post in this section for more detailed system requirements.