Sometimes after the upgrade you will not see the serial numbers like above or you may just see the DivX Plus Convertor 8.0 serial on the control panel it will just say registered if you want this to show you need to create a reg file replace the "" with your 20 digit serial that you purchased and all will now SHOW on the control panel the latest version of the procodec is v6.9.2 This application is a much easier and 99.99% guaranteed to work to remove registry key and leftover folders even from previous uninstalls.
If you do get this then I suggest using jv16 Power Tools v1.0.0.124 is FREE but it is limited to what you can do the full version now v1.9.0.590 time of posting you can get from HERE if you can afford it then you should get REVO Uninstaller Pro check out my tip HERE for help and advice plus a 20% discount. MAKE SURE THAT YOU UNINSTALL THE DivX v7.0 PRIOR TO THE INSTALL OF v8.0 PLUS OTHERWISE YOU MIGHT BE CONFRONTED WITH THIS AND HAVE TO TOTALLY REMOVE v7.0 and v8.0 FROM YOUR REGISTRY BEFORE THE UPGRADE Stumbled across this the other day and it really does work I have been using DivX products for about 10 years now since the Dr.