I just downloaded this https://www.softpedia.com/get/Multimedia/Audio/Audio-Plugins/Auto-Tune-Evo.shtml installed it on WinXP and it loaded into the 32bit VSTHost.
It gives you so many trial days.

You can also use ReaTune in Reaper combined with ReaTrak it will import the tracks and chords from RealBand, Biab or the BiabVst Plugin running in Reaper. Reaper has themes to give whatever mixing board you like.
Or you can send the audio from the Realband track to Reaper with ReaStreamVST in RealBand using the ReaTune plugin in Reaper.
You should be able to send the output back to a RealBand track using ReaStream also.

(Video) How to Stream Biab Tracks to Your DAW Win/Mac for Heavy Plugins
ReaTrak Integrate Biab & Plugin in Reaper
Free Biab & BiabVST Chord Picker Tool