Index: src/wp-admin/js/theme.js
===================================================================
--- src/wp-admin/js/theme.js	(revision 29907)
+++ src/wp-admin/js/theme.js	(working copy)
@@ -1559,6 +1559,7 @@
 	routes: {
 		'theme-install.php?theme=:slug': 'preview',
 		'theme-install.php?browse=:sort': 'sort',
+		'theme-install.php?tab=upload': 'upload', // Back compat
 		'theme-install.php?upload': 'upload',
 		'theme-install.php?search=:query': 'search',
 		'theme-install.php': 'sort'
Index: src/wp-admin/theme-install.php
===================================================================
--- src/wp-admin/theme-install.php	(revision 29907)
+++ src/wp-admin/theme-install.php	(working copy)
@@ -189,6 +189,7 @@
  * @param int $paged Number of the current page of results being viewed.
  */
 if ( $tab ) {
+	$paged = empty( $paged ) ? 1 : $paged;
 	do_action( "install_themes_{$tab}", $paged );
 }
 ?>