The Installer with MacDraw Pro 1.0v1 and 1.5 cannot replace/update the Claris XTND System file (v1.2) from FileMaker Pro. When attempting to install MacDraw Pro with v1.2 of this file present, a dialog box appears telling you that installation cannot take place. Here's what to do:
1. Quit the Installer.
2. Trash the Claris XTND System file currently on the hard disk (don't just drag it to the desktop).
3. Run the Installer again.