Brilliant but IPN needed updating

I love this plugin. It has been great for our wedding website. However, to get v2.0 working on 4.4 I had to make some updates to the IPN code. I am sure this is because PayPal has changed something since this was released and development was stopped. The changes that I had to make to get this working was:

In ipn_handler.php I had to make the following 2 changes:

Line 92 change to:

$custom = $_POST['transaction_id'];

Line 162 change to:

where id = '$custom' ; " ;