Right-click the installer executable (often named PL2303_Profiler_DriverInstaller.exe or similar) and select .
Right-click the .exe file and select Run as Administrator .
The yellow exclamation mark should instantly disappear, and a working COM port number (e.g., COM3) will display next to the device name. How to Prevent Windows Update from Overwriting the Driver prolific usbtoserial comm port version 333114 driver
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Visit the website of the device manufacturer or the Prolific website to see if there are updated drivers available for Windows 11. Microsoft Community Hub Prolific Usb-to-serial Comm Port Version 3.3.3.114 Download How to Prevent Windows Update from Overwriting the
Since this is an older driver, it is rarely hosted on the official Prolific download page anymore. It can be found on many tech support forums (like Elec-Man or similar hardware forums) and legacy driver websites.
Because Windows Update automatically overrides older software, you must explicitly instruct your operating system to use version 3.3.3.114. Follow this exact sequence: Step 1: Download and Extract It can be found on many tech support
Prolific creates the chip designs for these adapters. Over the years, many third-party manufacturers began producing "clone" chips that act like Prolific chips but aren't genuine. Prolific updated their newer drivers (version 3.4 and higher) to detect these fake chips and intentionally disable the device to prevent instability.
When dealing with Prolific USB-to-serial drivers, remember these key points: