The manual is great, don't get me wrong. There is a bit of incorrect information in the "Initial Setup" section. I don't seem to have access to edit so I'll spell it out here.
#1 - You can just plug in the Dongle to your Windows 7 (and presumably older versions) and windows update will find and install the drivers for you. Not only have I tested this, if you follow the instructions step by step you are actually doing this and not installing the drivers manually.
#2 - When you extract the driver files to D:\Christmas Lights\LYNX Equipment\DMX Dongle v2.0\Drivers this doesn't actually install the drivers. The next step is plugging in the dongle to a USB port and at this point Windows will do one of two things - #1 - find the drivers via windows up date or #2 - ask for the drivers disk. If it asks for the drivers disk then point it to the D:\Christmas Lights\LYNX Equipment\DMX Dongle v2.0\Drivers location and it will install the drivers.
#3 - if you want to set up the drivers manually then you extract the zip file anywhere, then you need to right click on the "ftdibus.inf" file and select install. Then right click the "ftdiport.inf" file and install. This step will actually install the drivers. Without this step all you have done by downloading and extracting the driver file is added some files to your hard drive. Unzipping the driver file does not actually install any drivers.
So If I were rewriting the instructions I would say first plug in the dongle to the USB port while the computer is connected to the Internet. Wait and see if the drivers get installed automatically. If they do you will receive a note stating the comm port you are using.
If this doesn't work then disconnect the dongle, download the drivers, extract the files, and right click on both .inf files and select "install" from the contectual menu. After they install the drivers reconnect the dongle and try again.
If this fails you can open the hardware manager from the system menu in the control panel and you will get an option there to install the drivers. Let windows update do it's thing or point it to the driver download file.
Thanks.