Hi - I couldn’t believe this when I read it…
Went to the WL manual/webpage to confirm that C12 appears to be not supported.! That’s a big shame.
On to the WL forum to investigate further and found you’d already posted there and had an answer from the WL dev himself -
So my suggestion, sadly, is that your question/topic here should be for a ‘Feature request’ to provide an update to C12.0.70 that allows WL12 ARA2 plugin access.
Bummer… (can’t imagine anything will change on this any time soon for you mind…).
Having said that, they have in the past always released a final update, to the last major version to tidy up loose ends, some months after the release of the newest major version. Maybe, something to look out for come the summer.