I've managed to find the official website, but this is what it says about the product you're looking for:
End of Interactive Support Notice: Intel no longer provides email, chat or phone support for this product.
As you can see, the product isn't supported anymore which means that support doesn't actually exist nor downloads.
You can use the following page to obtain additional information: https://downloadcenter.intel.com/product/63392/Intel-Wireless-Display-Intel-WiDi-
