Try the following code that should remove "Downloads remaining" and "Downloads Expires" from everywhere (even on email notifications):
add_action( 'woocommerce_account_downloads_columns', 'custom_downloads_columns', 10, 1 ); // Orders and account
add_action( 'woocommerce_email_downloads_columns', 'custom_downloads_columns', 10, 1 ); // Email notifications
function custom_downloads_columns( $columns ){
// Removing "Download expires" column
if(isset($columns['download-expires']))
unset($columns['download-expires']);
// Removing "Download remaining" column
if(isset($columns['download-remaining']))
unset($columns['download-remaining']);
return $columns;
}
Code goes in function.php file of your active child theme (or active theme). It should works.