You can register your aXbo by submitting a request - there you will find the subject "aXbo Registration".
Before it you have to sign up to the aXbo Support - here you will find the link to the Help Center.
However at the moment you don't have to register your aXbo in order to download the aXbo-software.
Here you can download the aXbo-software:
http://software.axbo.com/index.html