If ArcGIS Desktop 10.5 is on the same machine, CityEngine 2015.1 authorization fails with the following error: "7109:Invalid activation ID: <authorization number>."
Launch the Software Authorization Wizard from a command prompt in the Esri CityEngine bin directory.1. Open a command prompt.2. Run the below commands to start Software Authorization Wizard and specify 10.4 version: a. cd <a href="file:C:/Program" target="_blank">C:\Program</a> Files\ESRI\CityEngine2015.1\bin b. softwareauthorization.exe -s -lif *.prvc -ver 10.4 -verbose3. Complete authorization process.