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Can multiple versions of Esri CityEngine be installed on the same machine?
Most ArcGIS software requires a complete uninstall of the previous version before upgrading to a newer version. However, this requirement is different for CityEngine. CityEngine utilizes unique destination folder locations established for each install, therefore it is possible to have multiple versions of CityEngine installed on the same machine.
It is usually best to stick with a single version; however, in some cases there may be a necessity to use a different version for a particular task.
If the default installation location is not changed, the new software overwrites any existing installations in that directory. Shortcuts and Start menu icons then reference the newer version.