I have the same problem already exposed by Dathho and Max.Noise. Halion Sonic SE was my favorite GM player in Biab until 2022. It worked fine and you chose it through the menu "Options/preferences/midi driver...." But in 2023 Steinberg released Halion7 and Halion Sonic 7. (both vst3), removing the SE version (vst2). They no longer worked with Biab, neither did the old Halion Sonic SE. No problem, never mind. Coyote is not bad

Now, in Biab2025 I tried replacing Coyote (vst2) with the latest Halion Sonic (vst3) via the "options/preferences/midi driver menu". But this was not possible because Biab does not include vst3 in the list of GM players. It only allows you to add a vst3 on individual tracks. And sure enough, the program closes when you try to put Halion on a individual midi track.
I would love for Halion to work in Biab2025