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I Have Updated My PC And Now My Pen-DTU Is No Longer Working

There are two drivers for the Pen-DTU: One for 32bit operating systems and one for 64bit operating systems. When installing the driver, you should choose the one for your version of Windows. Version 2.3.3 will automatically install the proper driver. If you have version 2.3.2 and 64 bit operating system, you may need to manually install the driver.