Does a version of VST 2.5 of Halion 5 exist?

I would like to use Halion 5 and perhaps some of my other Cubase 8 instruments in Bitwig Studio. Bitwig, among other limitations does not support VST 3.0 . Are there versions that would work and if so where are they installed and how do I get them?

Not if you are on Mac. I think there is a 2.4 version of Halion for windows, which I assume comes on the same installer as the rest. They are a little inaccurate on their web:

Whirly’s statement is correct. HALion 5 is only available as VST 2.4 under Windows and as a plug-in.