Version 7.2.0 contains a fix for the Store screen, which stopped working soon after version 7 was released. It uses the code from version 6, combined with the improved user interface of version 7.
The billing library has been rolled back to version 3, but there was no deadline for version 4 anyway. This will give me more time to focus on the new Dropbox API.
The new release also uses a permanent SSL certificate provided by the web host, rather than the temporary one provided by Apache. This may help with some devices.