If you need more than the basic secure download, it will require modifications, but QuickSold is built in a way that it should be rather simple to do.
You may be selling a productized service or consulting, or selling access to private content or video. You may want to create a member area, or a private forum, or sell license keys to your software, or create a custom report or data result set. It could be that you want to sell pre-orders, or even accept sponsorships for your podcast or similar. You may even want to sell physical products.
Whatever you want to do, this guide shows you some simple ways to do it so you can focus on making money, instead of building a payment system from scratch.