Hi,
I have a 2012 Server that is refusing to install July's CU with error 0x800F0922:

Plenty of space on C: drive
Have done SFC /ScanNow
Have done DSIM cleanup and restore health
Have cleaned out SoftwareDistribution folder
This fails from WSUS as well as getting the MSP file from the Update Catalog. The latest SSU and another non-CU update installed just fine:

This is a production system and migrating to a new Server is not an easy task in this case. I've looked at other posts but can't see anything I haven't tried.