If you lost your CD and the official site is down, contact Kinghun support directly via email or phone. Many Chinese-based manufacturers (Kinghun is likely such a brand) respond best to direct support requests.
The software utilizes a "pass-through" mode. For a 36-inch wide blueprint, the scanner can process up to (color) or 22 inches per second (B&W). The software buffers data to your SSD to prevent bottlenecks. Kinghun High Speed Graphic Scanner Software Download