How to keep MainMenu authorized:

Choose MainMenu > Preferences and click Advanced.

Select “Keep authorized”.

Enter an administrator password and click OK.
Some tasks — such as cleaning the system cache — require you to enter an administrator password. You can let MainMenu remember your password so you don’t need to enter it every time you run an authorized task.
Choose MainMenu > Preferences and click Advanced.
Select “Keep authorized”.
Enter an administrator password and click OK.