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After I installed Digital Performer, AudioDesk, or Unisyn, entered my name and keycode, and pressed okay, the box disappears for a few seconds and then asks for my name and keycode again or says my demo version has expired.
This is due to incorrect file permissions.
Mac OS X has a system of access privileges for each user that can become skewed over time. If the file permissions are not as they should be, the operating system will think that you do not have the access privilege to write the authorization file and will not allow it to be written. To correct the file permissions:
- Go to Applications/Utilities and open Disk Utility.
- Select the volume from which OS X boots.
- Choose Repair Disk Permissions (Apple recommends repairing your disk permissions from your OSX boot disk's Disk Utility).
- When that process has completed, launch the application.
- When you are prompted to do so, put the Installer CD in the CD-ROM, enter your name and keycode, and press OK. It should now accept the keycode and launch the application.
For more information regarding Mac OS X and file permissions, check out Apple's, Troubleshooting File Permissions in OS X