These errors can occur after the application has. The serial number appears to be invalid'.
When you try to start a CS5 or CS4 application, you receive one of the following errors: 'Licensing for this product has expired' 'The serial number you used to activate this product has expired' 'Invalid serial number. Find solutions to serial number errors that can occur when you try to upgrade an Adobe Creative Suite product. The serial number dialog box displays a red X. When you enter the serial number after having used any CS4 application in trial mode, the serial number is rejected. You cannot install these products with the Creative Suite serial number and media. These products require a separate serial number and media. Always use the suite installer, not an installer for a single product, unless you have Acrobat 9, Adobe Premiere Pro CS4 (32 bit), or After Effects CS4 (32 bit). I just purchased a new MacBook Air and would like to at least install Acrobat 9 on my new computer internal HD, and preferably. I purchased Adobe Creative Suite 4 Design Premium for Mac OS (disc installation version) back in 2009 and have had it installed on the same MacBook Pro for the last 8 years.
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