This note relates to the 4-port USB serial cable available here: http://www.get-console.com/shop/en/usb-to-serial-cables/91-4-port-expandable-usb-serial-cable.html
The four port serial cable kit should work directly with Airconsole with no further drivers to be installed.
If you want to use the cable by plugging it directly into a USB port on your Windows PC (Windows 7+) then drivers are available on Windows Update so most customers will have these drivers installed automatically by Windows.
In the event that the drivers cannot be located automatically on Windows Update, it is possible to install drivers manually. The 4-port serial cable internally contains an FTDI 4232H chip, the VCP drivers can be downloaded from here: http://www.ftdichip.com/Drivers/VCP.htm
Step by step instructions for installing FTDI drivers can be found on the FTDI support site: