Did the mac to windows import failed every get resolved?
You'll have to be more specific what you're asking about. I don't think there have been changes in the Quicken Windows import of a Quicken Mac data file. We've had some mixed reports about whether investment accounts do or do not import into Quicken Windows from Quicken Mac; banking account transactions generally do import okay.
The issue that was discussed in "Import Fail Mac to Windows" dated April 2022 by user Glowman handled by Quicken Jared. I am having the same problem with my mother's quicken. She is using the latest subscription of mac and windows