The Location Referencing setup package is designed to detect and upgrade an existing installation of Esri Roads and Highways for Server.
Common software upgrade questions
Do I need to uninstall earlier versions of Esri Roads and Highways for Server?
No. If you already have Esri Roads and Highways for Server installed, the Location Referencing setup will automatically upgrade it.
Do I need to back up anything before installing Esri Roads and Highways for Server?
No. All services and site configuration changes are preserved when upgrading.
If I upgrade to ArcGIS for Server, do I need to upgrade to Esri Roads and Highways for Server?
Yes. The version of Esri Roads and Highways for Server must match the ArcGIS Server version.
Do I need to stop my GIS services and ArcGIS Server before installing Location Referencing?
No. The Location Referencing setup will restart ArcGIS Server.
If I have a multimachine server deployment, do I need to upgrade each machine?
All machines in the multimachine deployment must be on the same version.