If the driver installs but still shows an error, your cable may use a very old "PL-2303XA/HXA" chip which Prolific officially discontinued in 2012. Version 3.3.3.114 is your best chance, but ensure you have disabled "Windows Update" for drivers, or Windows will immediately overwrite it with a newer, non-working version.
Because modern Windows environments automatically pull the latest incompatible driver, you must explicitly force the system to install and target version 3.3.3.114. Step 1: Clean Out the Conflicting Driver Disconnect your USB-to-Serial adapter from the PC. Press and select Device Manager . prolific usbtoserial comm port version 333114 driver