Sorry, my supervisor just stumbled on the answer, still new with playing around with this thing.
It seems that you didn't install the VSE extension file.
Please extract the VSE package and install the extensions (VIRUSCAN8800(169).zip) in the ePO server (Menu=>Software=>Extensions=>Install extension).
Yep that was it, thanks! I assumed once you uploaded the VSE packeges to the master repository it would populate the extensions, didn't realize I had to install them as well.