[Theme Horse Support Team]

Hi Pavel,

Its better to create your own forum topic rather than posting on others forum topic. Because other user also get notified if post on their forum topic.
Just create a folder name interface-pro-child inside wp-content-> themes. You need to create two file.
Style.css and
functions.php
Under style.css add this below code

/*
 Theme Name:   Interface Pro Child
 Theme URI:    http://example.com/twenty-fifteen-child/
 Description:  Interface Pro Child Theme
 Author:       Theme Horse
 Author URI:   http://example.com
 Template:     interface-pro
 Version:      1.0.0
 Text Domain:  twenty-fifteen-child
*/
@import url("../interface-pro/style.css"); 

and under functions.php add this below code

<?php

// Unhook default Thematic functions
function unhook_thematic_functions() {
    // Don't forget the position number if the original function has one

remove_action( 'wp_enqueue_scripts', 'interface_scripts_styles_method' );

}
add_action('init','unhook_thematic_functions'); // removes the header content by using hook interface_header

add_action( 'wp_enqueue_scripts', 'interface_scripts_child_styles_method' );

function interface_scripts_child_styles_method() {
	global $interface_theme_default, $interface_theme_setting_value,$interface_default;
   $options = $interface_theme_default;
   $options_setting = $interface_theme_setting_value;
   /**
	 * Loads our main stylesheet.
	 */
	// Load our main stylesheet.
	wp_enqueue_style( 'interface_style', get_stylesheet_uri());
	wp_style_add_data( 'interface-ie', 'conditional', 'lt IE 9' ); 
	
	if ('on' == $options['site_design']) {
	//Css for responsive design
	wp_enqueue_style( 'interface-responsive', get_template_directory_uri() . '/css/responsive.css');
	}
	/**
	 * Adds JavaScript to pages with the comment form to support
	 * sites with threaded comments (when in use).
	 */
	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) )
		wp_enqueue_script( 'comment-reply' );

	/**
	 * Register JQuery cycle js file for slider.
	 * Register Jquery fancybox js and css file for fancybox effect.
	 */
	wp_enqueue_script( 'jquery_cycle', INTERFACE_JS_URL . '/jquery.cycle.all.min.js', array( 'jquery' ), '2.9999.5', true );
	wp_register_script( 'jquery_fancybox', INTERFACE_JS_URL . '/jquery.fancybox-1.3.4.pack.js', array('jquery'), '1.3.4', true ); 
 	wp_enqueue_style( 'jquery_fancybox_style', INTERFACE_CSS_URL . '/jquery.fancybox-1.3.4.css', true);  
  $interface_google_font_loads = array();
   if( $interface_default['interface_general_typography'] != $options_setting[ 'interface_general_typography' ] ) :
   	array_push( $interface_google_font_loads,$options_setting[ 'interface_general_typography' ] );
   endif;

    if( $interface_default['interface_navigation'] != $options_setting[ 'interface_navigation' ] ) :
   	array_push( $interface_google_font_loads,$options_setting[ 'interface_navigation' ] );
   endif;

    if( $interface_default['interface_title'] != $options_setting[ 'interface_title' ] ) :
   	array_push( $interface_google_font_loads,$options_setting[ 'interface_title' ] );
   endif;

   if( 'PT Sans' == $options_setting[ 'interface_general_typography' ] || 'PT Sans' == $options_setting[ 'interface_navigation' ] ):
   	array_push( $interface_google_font_loads,'PT+Sans');
  	endif;

  	$interface_google_font_load = implode("|", $interface_google_font_loads);

  	wp_register_style( 'interface_google_font', 'http://fonts.googleapis.com/css?family='.$interface_google_font_load .':400,700italic,700,400,800italic&subset=latin,latin-ext');
  	wp_enqueue_style( 'interface_google_font' );
 /**
	 * Enqueue Slider setup js file.
	 * Enqueue Fancy Box setup js and css file.	 
	 */
	 	if( 'revolution-slider' != $options[ 'slider_type' ] && '0' == $options[ 'disable_slider' ] ) { 
		if ( (  'slider-on-everypage' == $options[ 'slider_status' ] ) || ( ( is_home() || is_front_page() ) &&  'slider-on-homepage' == $options[ 'slider_status' ] ) ) {
		wp_enqueue_script( 'interface_slider', INTERFACE_JS_URL . '/interface-slider-setting.js', array( 'jquery_cycle' ), false, true );
		}
	}
	wp_enqueue_script( 'interface_fancybox_setup', INTERFACE_JS_URL . '/interface-custom-fancybox-script.js', array('jquery_fancybox'), false , true);   
	wp_enqueue_script( 'backtotop', INTERFACE_JS_URL. '/backtotop.js', array( 'jquery' ) );
	wp_enqueue_script( 'scripts', INTERFACE_JS_URL. '/scripts.js', array('jquery') );
	wp_enqueue_script( 'jquery_custom', INTERFACE_JS_URL. '/jquery.custom.js', array('jquery') );
	wp_enqueue_script('easing', INTERFACE_JS_URL . '/jquery.easing.1.3.js', array('jquery'), true);
	wp_enqueue_script('quicksand', INTERFACE_JS_URL . '/jquery.quicksand.js', array('jquery'), true);
	wp_enqueue_style( 'jquery_fancybox_style' ); 

} 

/****************************************************************************************/
?>

Hope this may help to solve your problem
Thank you!