I also am unable to re-apply hotfix 2 as outlined in the aboved notes:
"Attempt to downgrade Solarwinds Job Engine v2.0.3 is not allowed"
Sorry folks there is some confusion here on our part, my fault.
SP1 includes HF2, so no need to re-apply.
If you cared about HF1, which is not something which is globally applicable to everyone, then you will need to re-apply that after upgrading to SP1.
Sorry for the confusion.
The Hotfix 1 files; AlertingEngine.exe.config and SolarWinds.Orion.Core.MessageActions.dll, did not get replaced by SP1 on my system. I see no need to reapply HF1.