This is my private to hide betheme license purchase error notice on admin panel.

disable-betheme-notifications-license-error.php

<?php

//This is variable is also used in parent theme i.e. BeTheme
//Set it false to show other betheme options.
define( 'WHITE_LABEL', true ); 

add_action( 'admin_menu','while_label_theme', 13 );
function while_label_theme(){
  if( WHITE_LABEL ){
    
    define( 'ENVATO_HOSTED_KEY', true );

    global $mfn_dashboard;
    remove_action( 'admin_notices', array( $mfn_dashboard, 'admin_notices' ), 1 );
    // Move theme options page under 

    global $MFN_Options;
    remove_action( 'admin_print_styles-'.$MFN_Options->page, array( &$MFN_Options, '_enqueue' ) );
    remove_submenu_page( 'betheme', $MFN_Options->args['page_slug'] );
    remove_menu_page( 'betheme' );

    $MFN_Options->page = add_submenu_page(
      'themes.php',
      $MFN_Options->args['page_title'],
      $MFN_Options->args['page_title'],
      $MFN_Options->args['page_cap'],
      $MFN_Options->args['page_slug'],
      array( &$MFN_Options, '_options_page_html' )
    );

    add_action( 'admin_print_styles-'.$MFN_Options->page, array( &$MFN_Options, '_enqueue' ) );

  }
}

?>

is it still working?

Your PHP code changes were not applied due to an error on line 3745 of file wp-content/themes/betheme/functions/theme-functions.php. Please fix and try saving again.

syntax error, unexpected token "<", expecting end of file

i get this error

You have received syntax error.
If you are not developer, then you might have code from <?php inside php.
So Just copy between <?php and ?>.

If still not works, try to copy it inside child theme