Installed 3.9.11_93 over 3.9.9_93, but Kriegstreiber's Engine sounds was not updated to v2.05. The updated DLC file did not download.
I deleted the old Kriegstreiber's Engine sounds in the DLC cache folder, updated again and everything installed properly.
_Aslain_logs.zip
Selected Kriegstreiber's sounds on component selections screen (attached), but they do not appear in the install summary, 2 screens later.
(They, of course, do not get downloaded or installed either.)
btw - Gnomefather's sounds install fine.