Connection ErrorBad RequestSession ExpiredSign in requiredForbiddenNot FoundToo Many RequestsServer ErrorBad GatewayService UnavailableGateway TimeoutHTTP Version Not Supported
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According to the message, HD is trying to update from the wrong location. You can try placing this file: https://www.dropbox.com/s/t9vzs83iwmx92fh/%23common.ini?dl=0 in the _HD3_Data\Settings folder. This file contains the addresses of the update servers.