Included on that page is the x64 and x86 versions of the PowerPivot Plug-In for Excel 2010.
PowerPivot for Excel can be installed on a computer that has 32-bit or 64-bit Excel 2010. If you have installed the 32-bit version of Excel, you must install the 32-bit version of PowerPivot for Excel. Likewise, if you have installed the 64-bit version of Excel, you must install the 64-bit version of PowerPivot for Excel.
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