I'm guessing something is wrong or has changed with the driver signatures, as when I'm trying to install the drivers on Windows 8 64-bit, I'm getting the following message:
Windows encountered a problem installing the driver software for your device Windows found driver software for your device but encountered an error while attempting to install it. Crystalfontz CFA636-USB The has for the file is not present in the specified catalog file. The file is likely corrupt or the victim of tampering. If you know the manufacturer of your device, you can visit its website and check the support section for driver software.
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