: Open Device Manager and expand the Ports (COM & LPT) section. You should see a listing such as "USB Serial Port (COM3)". Troubleshooting

: Obtain the correct "VCP" (Virtual COM Port) driver for your operating system (Windows, macOS, or Linux).

: On modern systems like Windows 10 or 11, simply connecting the device to the internet often triggers an automatic driver download.

: If the download is a .zip file, extract it first. Run the .exe or .msi installer.

: Extremely common but often subject to "counterfeit" chip issues where newer drivers may not work with older or unofficial chips. Visit the Prolific Support page for official files.