Getting Power Pivot
Power Pivot was introduced as a free, downloadable add-in for Microsoft Excel in version 2010. In Excel 2013, the way to get Power Pivot became complex, difficult and murky. This has improved. +Bill Jelen details in this video, how you can buy or subscribe to an Excel licence that has Power Pivot
But why would you want Power Pivot? What does it do? It brings the relational model to Excel.