Tritton Technologies (owned by Mad Catz at the time) has largely discontinued support for these legacy adapters. Their official website may no longer host the driver. However, you can still find verified, safe drivers through the following methods:
, was designed to turn a standard USB 2.0 port into a 15-pin VGA output. Resolution: Supports up to 1600 x 1200 for standard screens and 1680 x 1050 for widescreen displays. Tritton Technologies Usb 2.0 Vga Adapter Driver Download