This is an upgrade edition of PC Access. Please insert Disk 1 from your old copy of PC Access 4.00 (not Disk 1 from the Upgrade).
This message prompts you to insert Disk 1 from your old PC Access version 4.00 software. The Upgrade edition of version 4.20 requires you to have a valid Disk 1 from version 4.00 before the UAM can install your new user authorization.