just for referencing since this question has been posted quite a few times, and the fact that the official download location is empty has been reported to admins for several times.
The following location on the official site will probably remain useless for the rest of its existence and is virtually empty:
But you can dowload the most recent files for Halion 5 allways from here:
http://support.steinberg.de/ISOs/HALion_5_AppCont_1.iso
http://support.steinberg.de/ISOs/HALion_5_Content_2.iso
kind regards