Can’t update to trial version

I tried to opt for the trial version before buying the full version of this tool but I keep getting this error –

Downloading update from http://api.byonepress.com/1.1/GetPackage?plugin=sociallocker-next&assembly=premium&site=https%3A%2F%2Ftechzbyte.net&secret=31ab67fce0d54010a603108586284dd41529930862&tracker=0ec2f14c9e007ba464c230b3ddd98384…

Download failed. Unauthorized

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