Win10 and Win11 systems do not need to install drivers, plug and play.

Win7, 8 system needs to install CDC serial port driver, otherwise can not use the virtual serial port function. (Driving principle, can not look at :Windows7/8/VISTA comes with CDC serial device driver file USBser. sys, what is missing is the driver configuration file usbser,inf file, Copy the Windows 10 usbserinf file to Windows and comment out the SourceDisksNames and SourceDisksfiles to be used as a common driver configuration file for CDC serial devices in Windows7. The modified usbser.inf file exists in the folder. You can copy and save it. It is applicable to all CDC devices, no matter which device, and after installing it once, it will be automatically installed when inserting other CDC serial port devices.)