To remove an uploaded file in your E-junkie Seller Admin, you can upload a tiny replacement file -- e.g., a .txt file containing just a single character:

• Under Manage Products, click Edit Products;
• Select the product and click View/Edit Product;
• Under the Digital Delivery section, click the Replace Product File button to open a file-uploader window;
• Upload your tiny replacement file;
• If you don't want the product to issue a download at all anymore, untick Single File Download;
• Click Submit to apply changes.