<Add OfficeClientEdition="64" Channel="PerpetualVL2016"> <Product ID="ProPlus2016Volume" PIDKEY="YOUR-PRODUCT-KEY-HERE"> </Product> </Add>
This is the most common error. It happens because you have a leftover 32-bit Office application installed. You cannot mix 32-bit and 64-bit Office apps. download office 2016 64 bits
Once installed, open any application (like Word or Excel). You will be prompted to activate the product. Add OfficeClientEdition="64" Channel="PerpetualVL2016">
If you downloaded the "Professional Plus" ISO, it will demand download office 2016 64 bits
It offers better processing power for high-resolution graphics and complex calculations in PowerPoint and Word.