Summary: Do I need to install all the old versions of Rhino to install the V5 upgrade?
Related installation help: Troubleshooting Rhino 5 Installation

I have a new computer and I want to install Rhino 5. I have always purchased upgrade versions of Rhino. Do I have to install all previous versions and successive service packs??

No, but you need both your new Rhino 5 License Key and the License Key from your previous version of Rhino.

1. Download the latest Rhino 5 installer.
2. Run the installer using your Rhino 5 Upgrade license key.
3. During the installation, you are asked to enter the license key from your previous version of Rhino.
4. Complete the Registration and Validation of your new license.