Installing a KPN USB Adapter (Siemens Gigaset USB adapter 108) on Windows 7

Recently I found a KPN USB adapter in a box I had forgotten about, since it looked pretty cool I was wondering if I could hook it up to my Windows 7 (64 bit) machine.
Since i don't have a CD-rom or DVD-drive in PC and most drivers that come supplied with hardware are out of date, I tried downloading the drivers from the suppliers (KPN) website, unfortunately they have no Windows 7 drivers available

I also tried the manufacturer: Siemens, apparently they forgot they ever made such a device, however the drivers are still on the website, if you know where to look.