I had to look up the Acer to find its OS. As it is the full W8 then it will run Office. W8 RT and many other tablet OS's will not. Office 2013 or Office 365 (which could be the cheapest way for you) are downloaded and you insert the key, which you have bought, during installation.
How to get Windows 10 now: how to download and install Windows 10 even if GWX.exe is missing