No worries, and thank you for that final log. I think we have the cultrip here:
UnauthorizedAccessException: Access to the path ‘C:\Program Files\Epic Games\UE_5.4\Engine\Programs\AutomationTool\Saved’ is denied.
This line means that UE is trying to commit an action, but it does not have the permissions to do so, and that brings the whole process down. It’s a matter of admin rights and permissions.
To resolve this, you can either run UE itself as administrator, or run an elevated command prompt for the process, as seen in this thread’s similar scenario: