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If you've installed a copy of Adobe Photoshop CS4 on one of your company's Mac computers, the program may display an error message when you try to launch it, stating that its licensing or serial number has expired or that you're using an invalid serial number. You're not alone in your predicament -- or your frustration -- especially if you see this error message the first time you try to start up the program after you install it. How you handle this problem depends on whether your serial number actually has expired, or if you're seeing interference from a pre-release trial or pre-purchase demo version of the software.

Adobe cs4 master collection mac keygen. Cs4, cs5 mac activition crack only. Microsoft Office Home and Student 2010 for 1 PC Retail Product Key. Mejora el Audio en tu Mac (Boom) - Duration: 1:45. Download CS4 products. If you purchased a CS4 product, and you no longer have the installation media.

Expired Serial Number

Open the Apple menu and choose 'System Preferences.' Select the 'Date and Time' preference pane and change your computer's clock date to January 1, 2006. This workaround overcomes the Catch 22 that arises because you must launch the software to remove the old serial number, but the expired serial number prevents you from launching the software. You can leave the time set to the correct value.

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Start Adobe Photoshop CS4. 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. 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.

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Reopen System Preferences and select the 'Date and Time' preference pane. Reset your computer clock to the correct date.

Start Adobe Photoshop. 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. If you own a license for Photoshop CS, CS2 or CS3, you can use an upgrade serial number. Because Photoshop CS4 no longer represents the shipping version of the product, you can't obtain it from Adobe Systems. 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.

Interference from Pre-Release or Demo Software

Open your Application folder and navigate to the Adobe Photoshop CS4 folder. Inside it, locate the Uninstall Adobe Photoshop CS4 item and double-click on it to remove Photoshop from your system.

Open a Finder window and navigate to the Library folder at its main level. Within that folder, locate the Application Support folder and open the Adobe folder inside it. 'Shift'-click on the 'Adobe PCD,' 'Caps' and 'Backup' folders and press 'Cmd-Delete' to move them to the Trash.

Insert your Adobe Photoshop CS4 installation disc and double-click on its installer file, or locate and double-click on your downloaded installer file for the program. Follow the installation instructions. When you're prompted for a serial number, enter the number on your disc box or from the purchase-confirmation email message you received from Adobe Systems.

Tips

• In some cases, customers who participated in beta testing or who evaluated pre-release versions of Adobe CS4 software have trouble installing the retail product and activating it with a valid serial number. In these cases, traces of the test or evaluation software versions remain on the customers' computers, forcing them to use workarounds to get their products properly licensed and running. Most commonly, these customers must uninstall the retail version of the software and remove specific folders created by the installer, then reinstall the application. See Section 2 for this procedure.
• You can't reinstall a demonstration version of Adobe Photoshop CS4 after the 30-day evaluation period ends. To turn a demo into a working, licensed copy, enter a valid purchased serial number.
• If neither resetting your system clock and entering a valid serial number nor reinstalling Photoshop CS4 resolves the 'expired-license' problem with your copy of the program, contact Adobe Systems (see Resources).

Warning

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• Don't reset your computer clock to try to extend Adobe's 30-day demonstration software periods. If you do, Adobe's licensing provisions will deactivate the demo regardless of how much time remains before it expires.

About the Author

Elizabeth Mott has been a writer since 1983. Mott has extensive experience writing advertising copy for everything from kitchen appliances and financial services to education and tourism. She holds a Bachelor of Arts and Master of Arts in English from Indiana State University.

Photo Credits

• Oli Scarff/Getty Images News/Getty Images

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* Make sure you run an Adobe CS4 application once (use trial if asked). And after run any CS4 application, quit any open CS4 application.
* If you’ve previously entered a serial, run any Adobe CS4 application, go to the Help menu of it and deactivate. Quit any open Adobe CS4 aplication after deactivation.
* Open Terminal (found in Applications/Utilities/). In the terminal window, paste this:
sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts
* Hit return and type in your admin password of your Mac when asked
* A file will automatically open in TextEdit application. In TextEdit, choose right after the very last sentence of what is written before and at the bottom of the document paste fallowings:

127.0.0.1 activate.adobe.com
127.0.0.1 practivate.adobe.com
127.0.0.1 ereg.adobe.com
127.0.0.1 activate.wip3.adobe.com
127.0.0.1 wip3.adobe.com
127.0.0.1 3dns-3.adobe.com
127.0.0.1 3dns-2.adobe.com
127.0.0.1 adobe-dns.adobe.com
127.0.0.1 adobe-dns-2.adobe.com
127.0.0.1 adobe-dns-3.adobe.com
127.0.0.1 ereg.wip3.adobe.com
127.0.0.1 activate-sea.adobe.com
127.0.0.1 wwis-dubc1-vip60.adobe.com
127.0.0.1 activate-sjc0.adobe.com

* Close file and when asked, save it.
* Launch any Adobe CS4 application and enter a valid serial. The serial will be permanent and you will be activated your Adobe CS4 Applications.