Sorry to bump such an old topic, but I'm also looking for ENG LTSB (1607), although x86 for my 32bit laptop and I can't find it anywhere.
@OldMX use sfv patches to get it. Check @GezoeSloog repo for LTSB on his Signature (Collection): https://forums.mydigitallife.net/members/gezoesloog.263774/ Sfv info: https://forums.mydigitallife.net/threads/smartversion-tools-scripts.79415/