This is a known issue with Windows 64-bit.
As a workaround, you can install PDFG IPP Printer by following these steps:
1. Go to Control Panel > Hardware > Devices and Printers
2. Click on Add a printer to start the "Add Printer Wizard".
3. Choose the second option - Add a network, wireless or Bluetooth printer
4. Click on The printer I want isn't installed
5. Select a shared printer by name. Type in the following URL : http://localhost:8080/pdfg-ipp/printer
6. You'll be asked for PDFG credentials (username / password) to access the printer
7. On the next screen, select any PostScript printer driver.
8. Done! You should see a dialog confirming that you've successfully installed the printer.