Hello,
As many of you know, WK-Audio who did the ID-Controller for Nuendo went out of business quite some time ago.
Customers cannot access any of the documentation or drivers anymore because there is no WK-Audio website available.
This is why we decided to upload everything that WK-Audio was able to provide to our website - and including a new driver version that is compatible with Mac OS X 10.10 and 10.11.
The zip file can be found here: http://www.steinberg.net/en/support/unsupported_products/wk_audio_id_controller.html
There is no support involved here at all. It’s just an archive we offer to affected WK-Audio customers.