If you cannot find the official website, Windows has a built-in feature to search Microsoft's database for generic drivers.
A Google search for "Raymax USB Adapter driver download" will return pages like: Raymax Usb Adapter Driver Download
Raymax does not have a massive global support portal, but their regional distributors (particularly in Asia and the Middle East) often host driver archives. If you cannot find the official website, Windows
Most Raymax adapters ship with a small mini-CD or DVD included in the box. For desktop users with optical drives, this is the fastest way to install the driver. Raymax Usb Adapter Driver Download