The Esri Roads and Highways for Desktop setup package is designed to detect and upgrade an existing installation of Esri Roads and Highways 10.3, 10.2.x, 10.2, or 10.1 (including SP's) for Desktop to 10.3.1.
Important
Esri strongly recommends that all sample and third-party extensions or plug-ins be uninstalled before installing a newer release of an Esri product.
Roads and Highways for Desktop 10 and earlier users
You must uninstall releases 10 and earlier of Esri Roads and Highways for Desktop from your machine.