You can find all of our software on the ZDL Updater App page, on the What You Will Need tab: https://zeppelindesignlabs.com/product/zdl-updater/
With your experience, you probably will not need the app itself. Go ahead and tinker with the software to your heart’s content. We found it tricky to compile to run properly on its MCU. While the code is open-source, its further development is not something we are supporting, so we won’t be able to assist if you run into snags.
Let us know what you come up with!!