Summary: When Rhino 5 prompts that there's a new update ready to install, I choose to install the update and get “Error 2502”
Related installation help: Troubleshooting Rhino 5 Installation

Cause

The update installer doesn't have enough permission privileges.

Solution

1. Right-click on the Rhino 5 shortcut icon.
2. Select Run as Administrator.
3. Rhino 5's start splash prompts there's a new update ready to install.
4. Choose to install the update.