You cannot take action on a clients machine throug a browser. You can detect the browser version of the person surfing to your webpage and inform them that your web site requires IE6.0
Giving a web script the ability to take action on a clients machine outside the web browser container is an extreme security hazard and is not permitted by any browser.
The best way to handle your situation is a pop-up notifying them of the problem and a link to the download or a redirect.
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