Scratch directory is there but upgrade still fails.
I see 2 possible issues:
1) 2019-08-13T04:32:39Z esxupdate: 68706: HostImage: ERROR: Failed to send vob install.stage.error: [Errno 27] File too large
2) 2019-08-13T05:52:22Z esxupdate: HostImage: INFO: Installer <class 'vmware.esximage.Installer.BootBankInstaller.BootBankInstaller'> was not initiated - reason: altbootbank is invalid: /altbootbank is not a directory!
Any help to resolve those 2 issues? Thx