Index: src/wp-admin/network/themes.php
===================================================================
--- src/wp-admin/network/themes.php	(revision 26294)
+++ src/wp-admin/network/themes.php	(working copy)
@@ -221,6 +221,7 @@
 $parent_file = 'themes.php';
 
 wp_enqueue_script( 'theme' );
+wp_enqueue_script( 'theme-install' );
 
 require_once(ABSPATH . 'wp-admin/admin-header.php');
 
Index: src/wp-admin/themes.php
===================================================================
--- src/wp-admin/themes.php	(revision 26294)
+++ src/wp-admin/themes.php	(working copy)
@@ -107,6 +107,7 @@
 add_thickbox();
 wp_enqueue_style( 'theme' );
 wp_enqueue_script( 'theme' );
+wp_enqueue_script( 'theme-install' );
 wp_enqueue_script( 'customize-loader' );
 
 require_once( ABSPATH . 'wp-admin/admin-header.php' );