This is a trial and error step:
Boot to the Windows Media Creation Tool (MCT) > command prompt >
(Type:)
bcdedit | find "osdevice"
(identify the partition drive letter while in Windows RE)
(Type:)
dism.exe /image:w:\ /set-uilang:en-us
(change the drive letter w to the identified partition drive letter)
(reboot)
Open administrative command prompt and copy and paste:
dism /online /get-intl
If the default language is en-us then attempt an upgrade.