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: Adobe does not provide installers for Acrobat 9 to the general public anymore. You may only be able to get a link if you can prove original ownership to Adobe Customer Care Activation Servers
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The short answer is that Adobe Acrobat 9 Pro is no longer available as a legal free download. Adobe officially ended support for Acrobat 9 on June 26, 2013 : Adobe does not provide installers for Acrobat