Same problem, build number 16952, dated September 17th. I can start AoW3 in debug mode, with occasional error messages (with no visible impact so far).
I saw a message on the Steam forum, written by one of the developers and dated September 21st, that they have "dropped a patch that fixes the crash" and that debug mode is not required anymore. In another post I saw a note saying that the build number of the Steam version is 16980 or so, i.e. higher than that of the GOG version.
How comes that GOG doesn't offer the newest version to their customers? Are there quality issues with the patch, or are you trying to give your customers a reason to prefer Steam?
Don't get me wrong: I know that the update philosophies and systems of GOG and Steam are different, and a delay of 2 weeks may well be caused by this difference. Moreover, a workaround is available that seems to work, and it's embarrassing that a relatively new game like AoW3 isn't W10-compatible.
Nevertheless, a liitle note by GOG here saying that a patch of this problem has been received and will be published in the next two weeks (or so) would be a costumer-friendly gesture. And besides, to be honest, I don't like to see that Steam is better than GOG in certain areas. :-)