I'm trying to migrate a validated Quicken QDF from the current version of Quicken Premier Windows (R46.12 Build 27.1.46.12) and keep failing.
For a few years now, QMac has used a Quicken Cloud service to convert QDF files ... the old desktop QDF converter was 32 bit only and has been eliminated. This article:
https://www.quicken.com/support/converting-quicken-windows-quicken-mac-2016which always shows the updated date as 'today' is 100% wrong... as there is no downloadable converter any longer. The QDF file must be uploaded for conversion.

With today's version of QMac (6.11.3 Build 61147347.100), I do the usual process of selecting "Start from a Quicken for Windows file", and then follow the prompts to upload my Windows QDF for cloud conversion. The upload completes...

The process always ends with this message: "Could not import <QDF>. Quicken was not able to read the contents of your QDF file."

There are no logs to examine...because the process is done by a cloud service.
I'm wondering if the file format for QWin has changed in recent builds and the cloud conversion code is broken? I guess I'll try a fresh/fake QDF to check that possibility.
Any ideas?