In the past few years, we have covered a whole host of WooCommerce themes and plugins that facilitate selling digital files. The WooCommerce Bulk Download Plugin is also worth a look. It allows your customers to download the files they have purchased in bulk in zip format.
The plugin is pretty easy to use. Once installed, it lets you mark your digital products as downloadable. Your customers will be able to download one or more files from your store with a simple click. You can change zip button text and other settings in the back-end.