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I have just tried updating the Pro plug-in from 3.1.4 to 3.1.11 and am receiving the message above. The last time I updated was 12/4/17 and I did not have any problems. Nothing has changed on this site. I am not sure what might have happened.
Have you tried adding the License Key again via the admin panel and seeing if it still says it is valid.
If so, then try updating again after re-adding the license key.
Please let me know