Thanks, Wptski.
Interesting that, after this Tuesday's Windows Update, my OS is now IDed as 1609. As you,I went ahead and installed the ADK version designated for build 1607 and it work fine. Thanks again.
@ banshee: particularly with respect to Win 8, 8.1 and, especially, Win 10 build 1511 (where exiting ADK versions corrupted Win 10 1511 installations), MS is very specific in designating what ADK version to use - which is why I posted my query. You can read the MS announcement about build 1511 conflicts
here.
Monk