Please follow the steps below to manually add the security permissions required.
- Go to your applications folder
- Control Click on the Folder for Mavis Beacon Keyboarding Kidz
- Click on Get info
- Click on the yellow Pad lock in the bottom right hand corner.
- Enter the administrators password.
- In the section for Security and permissions set the dropdown next to everyone to Read and Write.
This should resolve your issue. If it does not please submit a technical support ticket.