Migration Guide : Planning the Upgrade : Upgrade Methods : Installing OpenROAD into the Same Ingres Instance as the Older Version of OpenROAD
 
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Installing OpenROAD into the Same Ingres Instance as the Older Version of OpenROAD
You can install the latest version of OpenROAD into the same Ingres instance. Doing so will automatically uninstall the previous version of OpenROAD before installing the new version. If the OpenROAD 5.1 Standalone Net Client option was chosen, OpenROAD 6.2 will not upgrade the OpenROAD 5.1 Standalone Net instance. If the OpenROAD 6.2 Standalone Net instance is chosen, then a different Ingres installation identifier will be used.
This method will not uninstall OpenROAD 3.5. In most cases OpenROAD 3.5 will be installed into an Ingres 6.4, OpenIngres 1.x, or Ingres 2.x instance. The OpenROAD installer will not allow OpenROAD6.2 to be installed into these installations.
If you want to compare the previous version of OpenROAD with OpenROAD 6.2 side by side, you may install OpenROAD 6.2 in a separate Ingres instance.