If you want to install Adobes PDF iFilter 9 for 64-bit platforms you can find the iFilter itself as well as manuals describing the configuration steps here: Adobe PDF iFilter 9 for 64-bit platforms. In the middle of the page you can download the PDFiFilter64installer.zip and at the bottom of the page there are manuals for SharePoint 2007, Exchange Server 2007 and SQL Server 2005.
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