The "D" suffix usually indicates the fourth detected serial controller from the same family. The actual silicon inside your device is most likely one of the following:
When you see in Device Manager, it represents a generic label Windows assigns to a Universal Asynchronous Receiver-Transmitter (UART) or USB-to-serial bridge chip that hasn’t been properly identified. Usb Serial Controller D Driver Download
Even after driver installation, errors may remain. Here’s how to fix specific error codes. The "D" suffix usually indicates the fourth detected
For devices using FTDI chips, download the VCP (Virtual COM Port) drivers . 2. Using Device Manager (Manual Update) Usb Serial Controller D Driver Download