Symptom:
After years of happily working, SFOS 2.1.0.9 Early Access broke the currently available builds.

Problem:
"This project is using private headers and will therefore be tied to this specific Qt module build version."

Solution:
Rebuild with early access SDK 1701. For everyone not able to, I've done that and uploaded arm and intel versions to: https://www.dropbox.com/sh/dhxj5mfk3...UKdW6fCSa?dl=0

Please note those files may be deleted at some point.
I've made no changes at all, just built it.
Enjoy!