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I need to install Flash Player Vers 6 for a particular Site

Is it necssary to Uninstall Vers 5 or will 6 Install 'on top' ?

Flash Player is not in my Add\Remove

I have browsed around Macromedia but nowhere can I find this snippet of information

They do have a Flash Player Uninstaller available for Download but my question is - is this necessary - is it actually a requirement to Uninstall the previous Version?

Thanks