1. Open Site Settings at the root of your site collection;


  2. Select Solutions, under Web Design Galleries;


  3. Select the already existing web part solution and Deactivate it;

    Deactivate WSP.gif

  4. Once it finishes deactivating, Delete the solution from the gallery.

    Delete WSP.gif

The BindTuning Web Part are now uninstall from the SharePoint site.