If you are upgrading from an earlier version, first remove the old version of the software from your system by moving it to the Trash and emptying the Trash. Follow the installation instructions as above. It is not recommended that you simply drag'n'drop a new version over the old version. Once installed, if you are using iCal scheduling, you should launch iRecordMusic and select the menu option 'Refresh iRecordMusic Calendar...' to refresh the calendar and ensure it is compatible with the upgrade.