I believe it was @TeamOS, who tried it and it failed, i found out it doesn't install by WU and @abbodi1406 made the effort to filter the update.mum info and showed the applicability list of the CU, it excluded Pro-Education and Pro-WS.
Okay thx I thought that's what I was seeing too but just wanted to verify since your success post kinda came after some of the others and wasn't clear which SKUs you were then possibly converting to which it sounds like also does not work (ie. kb4043961--->CORE---->WES2(ProWS) still results in 16299.15 and not 16299.19 above) which makes sense then if that whole package is just flagged as not applicable to ProWS.
Anyone know the reason why KB4033637 (Appraiser Update) for 1607 is being offered (since Aug) as a separate update and not included in any of the later CUMs ? I'm never sure whether to include it when building an updated offline wim and I've been leaving it out.