On whether Scrivener should fix that iCloud-Windows can't sync projects

In chronological order from this thread:

Got it! We are on our own. Maybe you should have opened with that?

After all the suggestions you and your compatriot gave in this thread, one might be forgiven thinking Scrivener supported cloud services. My bad I suppose.

Just one final suggestion. You may want to consider updating Chapter 14 of the Scrivener Manual. The one titled “Cloud Integration and Sharing” with this “official” position because it is confusing when one reads from the manual things like:

“Placing your Scrivener project into a cloud folder, so that it is available to every
computer you own, is today a natural concept that by and large works well with
Scrivener.”