Hello I use Cubase LE 4 on windows XP and my all of my halionOne presets but acoustic guitar have disappeared. I already googled this problem and I found a few other people who have the same problem, but use a different version of cubase, and the solution involves something that cubase le 4 doesn’t have.
Is there any way to fix this problem in LE 4?
There is a halionone installer for cubase le 4 and I used that and even updated halion, but they are still gone. There were some files there that cubase le 4 didn’t have. I checked
Steinberg\Cubase LE 4\VST3 Presets\Steinberg Media Technologies\HALionOne\Essential Set
and all of the presets were there, just not showing up.
Is mediabay detecting them?
LE 4 doesn’t have a mediabay plugin
Mediabay is not a plugin. F5 will bring up Mediabay, simply scan it for any HalionOne sounds.
Nevertheless, it is still possible that your version does not have Mediabay. You’ll be needing an upgrade soon anyway. 
Wait you mean upgrade to Cubase 4 or something or just get an update?
I just got LE 4 like 6 months ago.
Looks like Artist 6.5 will be your recommended upgrade path. I wouldn’t upgrade to Artist just for that though.
Can’t you right click and locate the presets in explorer?
oh wow. this is so frustrating.
so i opened cubase to see if i could right click and locate the presets, and now when I go to add a new instrument track and click “halionone” nothing is there. halionone itself is gone
i didnt change anything in the program from yesterday. it just broke itself
Durn. I would suggest a total re-installation.
I don’t like HalionOne anyway. That’s just me though.
Ughh and upgrading to artist 6.5 is another 100 bucks
how do i even know that this version will have bugs too?
Version 6 has fewer bugs than V. 4 or 5. They’ve had a good one and a half years to stomp 'em.
Also, IMO HalionOne doesn’t have any production-ready sounds. Sonic gets a good deal closer.