Before installing the old one, you must remove the new one that is failing.
: Once on the official website, look for a "Downloads" or "Support" section. Here, you should be able to search for the driver by specifying the model of your USB-to-serial adapter and your operating system. prolific usbtoserial comm port version 333114 driver
Prolific USB-to-Serial Comm Port, version 3.33114 driver, troubleshooting, driver installation, device not detected, serial communication errors. Before installing the old one, you must remove