Rebooting your system after installation will resolve this. On Mac after installation, your system performance may seem slower.For additional CS4 installation help, go to.
You can also install the software in trial, then input your new and previous serial numbers in the serialization screen shown during launch.
If it cannot find it, it will ask you to input the serial number of the product being upgraded.
If you are installing as an upgrade, the installer will check your system to find the valid upgrade product.If you downloaded the software from the web, open the folder, navigate to the application folder, double-click Setup, and then follow the on-screen instructions.
If the installer does not launch automatically, navigate to the application folder found at the root level on your disk and double-click Setup Mac OS to start the installation process.