That is not what we’re talking about here. B4II is a standalone VST that uses modeling to model an organ. It was discontinued by NI many years ago. Vintage Organs is a Kontakt based instrument that uses samples of modeling. It was offered essentially as a replacement for B4II when B4II was discontinued but it isn’t nearly as good.
I was disappointed in the discontinuation of B4II as well as PRO-53 which was discontinued at the same time. B4II and Pro-53 were strictly 32-bit plugins. I think NI determined that the effort to update it to support 64-bit just didn’t have a real profit motive given the effort and expense. While I miss them, I can certainly understand the business reasoning behind it.