VM will probably have to contact Radialpoint and ask them. Radialpoint provide the VMS software which is based on a Trend Micro engine. Perhaps VM will contact Trend Micro and ask them directly.
Get some security software which has been approved for WIndows 8 while you wait to see if VMS will eventually be compatible. As VMS still seems to have problems with some XP, Vista and Windows 7 systems I suspect it will be some time.