Downloadable file for 2013's powerpivot add-in

I got a new computer at work with excel 2013, but it doesn't have the power pivot add-in ....the downloadable .MSI file I'm finding for 64 bit version tells me I'm not running 2010, so it can't create the DLL. Yes, I did search for the 2013 excel add-in. Any ideas?

I know I downloaded it before and had to have the IT guys sign in to install it on my old laptop, but I didn't have this problem before.

Edit: I have the Professional Plus version of Office