I did have a couple of problems getting the email with the download to work which Michael happily checked for me and pointed out a couple of errors I had made, basically my mistake for not checking properly.
Couple of things to look out for newbies:
Make sure you have the full file path of your download.
When testing I had the price as 00.01 and it needed to be 0.01.
Thanks again Michael for your sincere support.
I only had one document to sell so wanted customers to be able to push the PayPal Buy Now button and go straight to PayPal and then once paid receive an email with the download link. I didn't want a shopping cart.
I had tried other extensions without success and no support but Tuan customised his extension so I could achieve what I wanted. He really went out of his way which I really appreciated.
The extension has nice clean code and is easy to install and configure.