The Affiliates manager plugin can be integrated with the Sell digital downloads plugin so that affiliate commission is given to the affiliates that send visitors to your store/site.
Step 1 (Install the Integration Addon Plugin)
Download and Install the Sell digital downloads Integration addon.
Step 2 (Keep the Main Plugins Active)
Simply keep both the Affiliates Manager and the Sell digital downloads plugins active on your WordPress site.
When you receive orders in the Sell digital downloads plugin, the affiliate plugin will award commission to the appropriate affiliate (if the customer was referred by an affiliate).