Cache Killer Pro requires the AppleScript system extension and five scripting additions - Choose File, Current Date, Display Dialog, File Commands, and Read/Write Commands.

The complete AppleScript package, which includes all these files, is included with System 7.5 or later.

If you are not using System 8.0 or later, you need the Finder Scripting Extension. (This system extension is automatically installed with the other AppleScript components when you run the System 7.5, 7.6, or 7.6.1 installer application.)