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PKIX path building failed:... error during activation of the UgCS license

"PKIX path building failed: sun.secrity.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"

Locate the file 'C:\Program Files (x86)\UgCS\server\ucs\ucs.properties' and change 'https' to 'http' for lines:

activationServer.endpoint=https://activation.ugcs.com
liveServer.endpoint=https://activation.ugcs.com