It seems that I found the solution: to avoid this error, you have to enter manually the Site and Secret keys into Shared Fields >> Captcha field settings.
The error message text — “Please set “Site key” and “Secret key” from admin panel by User Meta >> Settings Page” — still needs to be updated by plugin author to reflect v. 2.0 changes.
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This reply was modified 4 years, 10 months ago by lennyvaicek.