Untill the download link is repaired the direct download location is:
http://support.steinberg.de/ISOs/HALion_5_AppCont_1.iso
http://support.steinberg.de/ISOs/HALion_5_Content_2.iso
You have bought a license (on the e-licenser) and that is valid regardless of the operation system you are working with.
So it will work on any computer where the software is installed and where your dongle is attached to.
kind regards,
R.