Text Widget in Footer for just 1 page template

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There are a couple of options:

  1. Use a Plugin that adds contextual conditions to Widgets

  2. Only output the dynamic_sidebar() in the page template in question. For example, if your custom page template is named template-foobar.php, and the dynamic sidebar name is footer-text-widget:

    if ( 'template-foobar.php' == get_page_template() ) { 
    dynamic_sidebar( 'footer-text-widget' ); 
}