We are on Exchange 2019 cu6 su6.
When trying to apply CU7 fails with following error:
"The upgrade patch cannot be installed by the windows installer service because the program to be upgraded may be missing, or the upgrade patch may update a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch."
Tried to look for any setup log, but seems the setup couldn't start, and it doesn't have any log to review.
Appreciate any suggestions on troubleshooting this. Million Thanks!