If you didn't purchase a Photoshop CS4 license during the shipping lifespan of the product, you may be able to find a sealed or transferable copy on an online auction site. Because Photoshop CS4 no longer represents the shipping version of the product, you can't obtain it from Adobe Systems. If you own a license for Photoshop CS, CS2 or CS3, you can use an upgrade serial number. When the program requests a valid serial number partway through the startup process, enter the serial number for a retail version of the software with no expiration date on its license. Reset your computer clock to the correct date. Reopen System Preferences and select the "Date and Time" preference pane. Retail serial numbers for standalone copies of Adobe Photoshop or the Adobe Creative Suite don't expire, but demonstration copies and public beta-test or pre-release versions use licensing with short-term serial numbers. Open the "Help" menu and choose "Deactivate." On the deactivation screen, activate the check box for "Erase This Serial Number" and click on the "Deactivate" button.
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