Although downloads are not available yet, there is another way to copy the list of already researched keywords:
1. From the Cockpit, head to the Detail Page of one of your products
2. Move to the Keywords Tab and click on the "+" Button
3. Click on "from other product", choose a product and click on "add all keywords"
All keywords that were added to the chosen product should then be listed on the right side and ready to copy.