"ADT is compatible with System 7.6 for the most part. However, Desktop SpeedBoost and MakeOver will not load and will need to updated before they become functional. We are planning an update."
Additionally, John C. Rivard claims that: "Any attempt to use ADT's "Get Original Info" command - with StuffIt Deluxe's TFI installed - results in a crash. The only work-around is to load TFI before the ADT components."