Sarina, if you are downloading 2016 I suggest you get Microsoft support to assist you and they can do it so that you keep your old 2007 and get your new 2016 set up correctly. All you will need is your product ID. If you are loading from CDs or thumb drive, etc. I suggest you also contact Microsoft support to get directions about HOW to do what you are attempting because if anything goes wrong, they will be able to restore your product, etc. It saved my life after Windows 10 Prof. wiped out my 2007 Prof from my PC..