I've looked at the guide... Which I found confusing and hard to follow.  Eg. I don't understand why we need the full extracted custom install package as well as the deployment installer.

On a side note I tried to deploy Revit 2025 as well, and its got the same odd install behavior as well.  Fails the first time, successful the second!

2024-12-12T11:09:32.900 [Deployment: 10024, single] [******* ERROR] {8C6163F0-DD83-3C68-A0C2-C39B93B18ECE} : 1
2024-12-12T11:09:32.900 [Deployment: 10024, single] [******* ERROR] Deployment failed!
2024-12-12T11:09:32.900 [Deployment: 10024, single] [******* INFO] Please explore possible solution from: https://www.autodesk.com/support/technical/search?p=Revit&qt=Error%201&mktvar002=xxx-xxxxxxxx%7CEML

As I understand it {8C6163F0-DD83-3C68-A0C2-C39B93B18ECE} is the core Revit 2025 application?