Subscription products
Products with a one-time purchase (perpetual license)
The Power Pivot add-in for Excel 2010 did not ship with Office, but is available as a free download: Power-Pivot add-in download.
This free download works only with Excel 2010, and not with newer versions of Excel.
You can always ask an expert in the Excel Tech Community, get support in the Answers community, or suggest a new feature or improvement on Excel User Voice.