I have same problem as originally indicated in #29.
I have Clover 4220 installed and followed instructions for updating config.plist.
Thing is I have a dual boot system but not 2 separate drives. So "Macintosh SSD" is flush against "Windows".
Regardless of whether I use APFS or not (I'm not and I have checked it says FALSE to ConvertToAPFS already), when I try to do an inplace upgrade I get error that says changes to windows partitions map will render Windows unbootable and I get a "Restart" button.
From what I've gathered, installer trying to create Recovery Partition. For some reason, my OSX install did not create one. I mean it does not seem like a case of "lost partition" for me to reclaim it. I don't think there is a Recovery Partition. So if I'm on the right track, I need to shrink the OSX partition to allow place for Recovery Partition. How do I do that?
If I'm wrong, then hopefully someone can suggest what I can do. I was so happy I had Clover so I could do inplace upgrade. If I have to reinstall (assuming that does not come with its own problems so early on) that's a waste