Unable to Install EGit in Eclipse

I am trying to install EGit from this tutorial. It says to add the plugin url in Help -> Install New Software.

Put In my Case I am not getting the add button on Install New Software dialog (see Image)

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My eclipse 开发者_如何转开发version is

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I did a parallel Installation of Indigo as @VonC suggested.

Indigo already have EGIT :).