Halion 1

hi there, sorry this isn’t about halion 4 specifically, but there doesn’t seem to be a forum for older versions…
i’m looking for an installation for halion v1, as i’m currently running an old version of cubase vst and my previous installation of halion has stopped working. is it completely unavailable now or is there somewhere i can buy it? i’ve googled around but have found nothing…
many thanks x