Contact
Support for MakeSBS3D is one address: support@makesbs3d.com. Michael Edlund, who makes the app, reads and answers it.
When a conversion fails
Send the name of the disc, the version of MakeSBS3D from About MakeSBS3D, and the last lines of the Console (⌘.). With those three the cause is usually clear from the first reply.
License keys
A key is good for five Macs. When the sixth activation is refused, write and the count is reset. A purchase is refunded within 14 days of buying, no questions asked, and the key stops working once it is refunded.
Before writing
The FAQ answers the common questions, and the manual explains every control. Both are quicker than mail.