We have created both an Internet Explorer BHO Extension and a Firefox extension.
Basically, you would need to develop code to display the message "You need the current version of the plugin to view this channel". Additionally, the code would need to launch our custom install code to install our extension. (link for install code to be provided once the project is awarded).
We are anxious to get this coding complete, so if you have the skills and knowledge to complete this project, let's get it done ASAP!!!