I'm getting the same error as 'southcot' in the support forum.
This is the error message I get when hitting "Get Keys":
Unable to get Clickcha API keys (URL_EXISTS).
It seems that ever since I reverted back from a Multisite setup to a standard one-site setup, my Clickcha disappeared and no matter what I tried in the plugins panel (deactivate, install, reactivate, get Keys), nothing fixes it.
So does anyone know a good replacement to Clickcha? I really don't want to go back to Captchas though, I much prefer the idea that users only have to click a correct symbol to submit their comments.