If you want the stability of 8.1.1 but the features of modern Auto-Tune, consider using 8.1.1 for tracking (zero latency) and rendering the audio, then using a modern editor for mixing. It’s the best of both worlds.
I can also tailor the content to focus on the technical side of its 8.1.1 VST functionality if you need. Studio One 4 | Antares 8.1 | Windows 10 | Not functioning Antares Auto-Tune 8.1.1