Shoptopus: Invoice Generator

I looked for a simple app to allow customers to download the invoice and could not find it until Gemini pointed me to Shoptopus.
All in all, five stars do not make justice for this app. I would give it TEN.
Easy setup and it does what is says, right off the bat. And it's free.

Needless to say, Shopify should create the Invoice download link, but they do not do it. so Shoptopus is a great add-on. Highly recommended.