Versions of WebHarvy prior to (and including) 6.2.0.184 will receive an ‘Activation failed due to unknown reason’ error message while trying to unlock using the license key file (for registered users). This issue has been fixed in the latest version of WebHarvy 6.2.0.185 which is currently available for download at https://www.webharvy.com/download.html.
Please contact us in case you have any questions.