The wireless USB to wired USB part of the product are not supplied by DisplayLink. There are 2 companies that provide this part -
Wisair and
Alereon. Wisair have a lot of wireless USB adapters with DisplayLink in, so the probability is that its a Wisair chipset and you need the Wisair wireless USB drivers.
Both of these companies have Windows 7 drivers, so it should be possible to get the Wireless USB drivers for this product.
Wim