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To add multiple language support to an existing Rhino 4 installation, follow these steps:
1. Have the Rhino installation CD in the CD drive.
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2. Open the Windows' Add and Remove Programs control panel.
3.Find Rhinoceros 4 in the list and click on Change
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4. In the next dialog, click the Modify radio button.
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5.Select the languagees to install from the list in the next dialog box and click Next, follow the prompts through the rest of the installation process.