Based on my understanding we don't have a direct option in Launch to export the rules but you can obtain the complete download of your library by navigating to Environment Tab & clicking on the specific environment. After clicking on the environment name you will see an option to "Create archive" as shown below.
This will contain all of your rules, extensions & data elements.
Hope this helps.
Then this library is bifurcated into below sections - Can audit each of these sections as needed
1) Buildinfo details of that library
2) Data elements
4) Company (Org id)