According to here (threads/46984-Cannot-activate-Microsoft-Office-Professional-Plus-2013), i converted the office installer from retail to volume, but when I tried to activate the product with the product key from the MTK, it has a notice to change and all, but nothing goes through. I've removed and reinstalled to same package multiple times with ms's fixit, but it doesn't work still, and is there a solution to this problem? Thank you.
Why don't you download a proper VL-Version of Office 2013 and then you don't have to convert anything.