That update is particularly hard to find - you have to dig several windows deep into the control panel in desktop mode ... it's one of those inexplicable things that just dumbfounds me - they leave a pre-release version of Office on the tablets and then almost guarantee nobody will install the proper version by making the update UI impossible to find.
seriously? you can just type windows update (search will open for you) then select it to install - i don't know how it's too complicated. Especially since most people use windows already.
Fortunately it's not my machine :)