The most reliable source is the manufacturer's CH341SER.EXE installer, which supports Windows 7, 8, 10, and 11 (32-bit and 64-bit).
If your computer shows "USB2.0-Serial" or "Unknown Device" in Device Manager, follow these steps: CH341SER.ZIP - Nanjing Qinheng Microelectronics Co., Ltd. usb vid_1a86&pid_7523&rev_0254
The Hardware ID identifies a common CH340 USB-to-Serial converter manufactured by Nanjing Qinheng Microelectronics (WCH) . This specific revision (REV_0254) is frequently found in low-cost electronics, including Arduino clones (such as the Nano and Uno), ESP32 development boards, 3D printers, and generic USB-to-RS232 adapter cables. Driver Identification and Download The most reliable source is the manufacturer's CH341SER