The driver provided with PBP now has 64 bit support added. So you do not need the one I linked to, although it should still work.
I think your problem might be that you copied it to a directory rather than letting the OS install it. Try deleting the file from the sysWOW directory, then do a reboot.
When your project is plugged into your PC windows should bring up the usual dialog asking to install a driver. Do not let windows look for it, point to where the file has been saved to and let windows do the installing. You then should see a virtual com-port in device manager.
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