You need Windows computer, Windows XP service pack 3 or newer.
Check that you have .NET framework version 4.0 or newer installed. If you don’t know your version, look at C:\Windows\Microsoft.NET\Framework. Your installed versions are listed by directory:
If you need to update your version and have Vista SP2 or newer, you can get if here, for older versions here.
Download and run the installation program.
The connection needs a virtual com port (VCP) driver from FTDI; your system might not have it. The driver is available here.