They did the 1710 to 1802 a few weeks back without any issues.
The prereqs passed and they started the upgrade. It failed and they decided to remove AV as they thought it might be a contributing factor.
Tried upgrade again still fails on Install Update Files step in the setup process. I started to review the CMUpdate.log to see what errors was being written.
I could not copy the content of the file but below is an example of what was in the log:
Cannot create D:\Program Files\Microsoft Configuration Manager\tools\UploadOfflineFeedback, [error code: 5, error message: Access is denied.]. CONFIGURATION_MANAGER_UPDATE 9/26/2018 13:35:43 1796 (0x0704)
ERROR: Failed to create directory D:\Program Files\Microsoft Configuration Manager\tools\UploadOfflineFeedback CONFIGURATION_MANAGER_UPDATE 9/26/2018 13:35:43 1796 (0x0704)
Setup has encountered fatal errors while performing file operations. CONFIGURATION_MANAGER_UPDATE 9/26/2018 13:35:43 1796 (0x0704)
Failed to install update files. CONFIGURATION_MANAGER_UPDATE 9/26/2018 13:35:43 1796 (0x0704)
So compared their setup to my LAB and everything seemed in order. Did some research and came across a Technet forum post about permissions missing on the folder.
Asked the team to confirm if Builtin\Administrators and SYSTEM had full permission on the Tools folder. They confirmed that both entries were missing. Not sure who changed permissions on the Tools folder but after adding the accounts back and retrying the update, 1806 installed without any issues.
