WDDM 1.3 will be fully supported by 4th Generation Intel® Core™ Processors with Intel® HD Graphics. If your system is using a 2nd generation Intel® HD Graphics, this will only have WDDM 1.2 support and the drivers for it will be provided only by the operating system itself and updates for it would be available through Microsoft* updates.
For this you can check the following Microsoft* article that includes a driver for your controller:
Keep in mind that as this driver is provided by Microsoft*, you should check with them directly for any issues you may encounter while using it.
2 years support only? please reconsider. wddm 1.2 on windows 8.1 is bad performing compared to windows 8.0 or 7.0. but windows 8.1 has direct x 11.2 (software support as opposed to hardware 10.1) and other advantages and therefore we need wddm 1.3 in order to properly support windows 8.1 with proper native driver wddm 1.3. 2 years driver support is short isn't it???? it will be your loss in the future in respect to bad reputation for not supporting hardware in the long term even though quality wise you are top on my list. Thanks