Hi Judy, Hi Marv6,
I saw the failure on two different systems here (different hardware). It appeared the fix failed as soon as it "discovered" that the recovery partition was too small. No aftereffects to report. My patch to Microsoft’s fix also appears safe so far.
As far as I know, none of Microsoft's usual debugging techniques or automatic system fixes attempt to diagnose disk partition issues like this one. Mostly users only get to create new partitions, especially system managed partitions like this one, as part of an install or as part of "cleaning" a disk to remove existing partitions. diskpart is one of these tools as is "Disk Management". Even now I expect that any current, unfixed Windows 10 installer will still create a recovery partition that's too small to install this patch.
Here's what my partitions look like on one of my Windows 10 boot drives. The first unallocated partition (530MB) was the original recovery partition. The new, current recovery partition is now last because that's where I could create a 780MB partition that would fit. Enlarging the original partition in place would mean moving the other partitions out of the way.
Art