How do I stop the persistent prompts to install Citrix Workspace?

If Citrix Workspace is already installed, but it still prompts with "Click Install to access your applications":

• In Internet Explorer, click on "Tools".
• Select "Compatibility View Settings".
• Type onenet.co.nz , and click "Add".
• If prompted with "The previous webpage wants to run the following add-on: 'Citrix Systems, Inc' from 'Citrix Systems, Inc' ", click "Allow".
• Proceed to logon with your OneNet credentials.