Alexandre questions were answered via support ticket. Here are the answers for reference:
If you are migrating the same organization from 2011 to 2015 you will need to contact us to let us know which environment you need the new solution for and then notify us once the update is complete so we can update our records.
Once you have our solution installed in your 2015 environment, then the auto-update options should keep you updated without needing to request a new package.