I downloaded Microsoft Office 2013 Professional Plus, had some problems due to Microsoft Office pre-download already being on new Windows 8 Computer.  When I uninstalled the regular Office pre-download and failed Office Professional Plus download I went to enable the Power Pivot add-on.  All three of the options listed here on Microsofts website did not work.

I have tried unistalling and reinstalling and it still has not worked.

On another note, I need to be able to freely switch between PowerPivot 2008 and whichever model I use now.  Would it be best to just get a refund for Office 2013 Professional and switch to Office 2010 Professional?  Or is there a way to make them work together?

Thanks 

Hi,

Did you mean that Power Pivot add-in does not available in Office 2013?

First, check to see whether there is any previous version of Office installed in the computer, if it is, then uninstall them then re-install Office 2013 to check the issue.

For how to uninstall, please refer to the following link:

http://support.microsoft.com/kb/2739501