Halion Sonic SE 2 only works with Cubase.
But you could install the Halion Sonic SE 3. It will replace the HSSE 2 but all the content you have bundled with Cubase AI should stay intact.
It works as standalone application and can be used as plugin in other Daws.
[u]https://www.steinberg.net/en/landing_pages/halion_sonic_se_3/halion_sonic_se_free.html[/u]