Sorry for the delayed response. You do need an active subscription to run the Autotune configuration tool. However, you can make the changes you need to your domain settings by accessing the
Facebook Developer Area
and updating any settings in there as necessary for your new domain.
Also, please note that the v5.x release doesn't support many of the changes that Facebook has introduced recently and will no longer work at all for authentication on April 30, 2015. For more information on the changes, please see our
Facebook Graph API v2 changes
blog post.
I hope that helps, but if you need anything else, just let me know.
Alex