To update your copy of MacAttack, please follow these steps:
1) Double-click on the archive file "MacAttack update.sea".
2) Follow the instructions in the 'Sound Manager 3.0' folder. (You need System 7.1 or later to use the new Sound Manager).
3) Double-click on the 'MacAttack Updater' program and follow the instructions. You will be asked to select your old 'MacAttack' program file. (If you have problems, try re-installing the program).
4) Copy the 'Game.DATA' file from the 'MacAttack update folder' to your 'Mac Attack folder' replacing the older one.