Will it cost money to download the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007?

or is it free?? I have an older version of the Microsoft thingy but it's 2003 and it was already on my computer. So will I have to pay for the new version when I download it? Can someone help me and tell me about Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats?
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