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Right-click the .exe installer and select Run as Administrator . If you are installing from a .zip file, extract all files first.

This often occurs with older Prolific chips on Windows 11. To fix this, you may need to manually roll back to an older driver version (like 3.2.0.0) that still supports legacy hardware.

3.8.19.1 (Latest stable release for most Z-TEK models) Release Date: January 19, 2018

Once the installation wizard finishes, connect your Z-tek adapter to a USB port. Windows should automatically assign it a COM port number . Verify in Device Manager: Right-click the Start button and select Device Manager . Expand the Ports (COM & LPT) section.

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