The v2 is not open source and is not available for licensing either.
bustabit sells software license for version 1 of bustabit. Version 2, which bustabit.com is currently running, is not available for licensing. The software is provided as-is and buyers should be prepared to maintain and modify the code themselves.
If you're interested in purchasing a v1 license or have any questions about it, please contact me via email at
https://www.bustabit.com/support.