Showfom's WordPress

I install a new WordPress 2.8 and I want to install some plugins in the dashboard.

I searched Super Switch and install , but it says “The plugin does not have a valid header.” and I can’t find Super Switch plugin in the dashboard.

So How to solve it?

Let me tell you, get into the folder of this plugin ,for example Super Switch ( wp-content/plugins/super-switch/ )
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