Can't validate Chronoforms on localhost

Hi
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I have a valid key for a local domain (temp4.off). If I try to validate I get following error message:
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CURL Error: SSL certificate problem: unable to get local issuer certificate

We could not connect to the chronoengine.com web server.

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This is new. So far I always could validate Chronoforms on a local installation.
What can I do to validate? I can't use SSL on my local PC with localhost.
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Thank you very much!
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Patrick
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Joomla 3.8.13, CF 6.0.20

Hi Patrick,
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Please use the Contact Menu above to ask Max about validation questions. I think that in this case he may suggest switching to an Elastic subscription that doesn't need to contact the chronoengine site.
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Bob

Hi Bob and thank you
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The Elastic validation gives same error message :-(
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Will contact Max.
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Patrick

Hi
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Max did provide a solution:
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I had to enter the validation key AND the serial number. Then it worked. I still got the curl error message but the validation was successful anyway.
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Patrick