My products are made of multiple files of approx 1GB each. Customers need to be able to download files by using a download manager. Resuming capabilities is a must, together with the possibility to download multiple files at once.
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Working with a Magento shop which deals with downloadable products I can say: Yes, Magento is the right platform to sell downloadable products.
As you have to deal with big files, this is more up to your server/PHP configuration (
max_execution_time, etc.) and not a limitation of your Magento shop.
Regarding your products including multiple files: For each product there is a setting "Links can be purchased separately".
Ben already answered on resuming capabilities and downloading of multiple files at once. I don't know any extension providing this functionallity either and would also leave this up to the users chosen download manager or implement custom functionality.