Assuming that you have properly entered all of the digits in the code, and that you have admin privledges, please try the following. The reason is that on occasion, the Mac OS can become confused as to who has what permissions to do what and where. There is a utility that can generally remedy this situation. Proceed as follows:
Open the Mac hard drive.
Navigate to "Applications/Utilities/Disk Utility".
Double-click to launch the "Disk Utility" application.
Click on the "First Aid" tab.
Select your hard drive in the left panel then click on "Repair Disk Permissions".
Depending on the speed of your processor, the size of your hard drive, and the number of files that you have stored, this process can take several minutes to complete. Once this task is completed, attempt to install the Monaco application again. In virtually all cases, this repair does the trick.
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