Ok I think I've sorted it...

It seems to use these drivers you have to replace whats called the 'inf' with one thats been modified. You'll notice on the download page above that there's a link for the driver and then next to it in green letters is the inf link. Next to that is a link to a quick guide to get you through the install process. I did copy a small section and I'll paste it here:
Basically it's a 3-step process:
1. Download driver, double click and select extract,
2. Download modded INF and replace original INF in extracted folder,
3. Install & reboot.
When you open a driver thread, you will see several links like
Driver and
Modded INF, which are all you need to install the driver you want. First click
Driver link to download the related driver which comes
WITHOUT the needed INF file.
For example, if you choose
84.25 driver to install, driver file will be
8425.exe and when extracted it should create another folder named
8425.
Next step is getting the Modded INF and replacing the old one. Click on the
Modded INF link to download the file. If file opens instead of downloading go back, right click the link and choose 'Save target as...' or 'Save link as' options. Now it should ask where to download the file. Select the
8425 folder. If you did it right, there should be a file replacement confirmation dialogue. Replace the file and you are now ready to install the driver.
Hopefully this will allow you to use the drivers. Let me know how you get on..Good luck
Just to add, I did try the links and they work.. So just download the driver, extract it to a folder. Then download the inf and use that to replace the one in the driver (which your going to have to find). You should then be able to install the driver in the normal way.