Just write them an email to email@example.com, within a few days you'll get an invitation to join the beta program.
If you have rooted your phone use this to prevent Z Launcher from detecting root: http://repo.xposed.info/module/com.devadvance.rootcloak
I finally made it, the Nokia Z Launcher 0.3.2 is "cracked".
This time it was a lot easier and took me only a few minutes since they didn't change anyhting on the checks.
Thanks to Dhiraj for posting the original apk file. http://forum.xda-developers.com/show...3&postcount=21