Authentication Error when trying to use the Extensions window

Hello, I have been a frequent user for Sketchup and have never run into any problems until recently. I tried to go into windows → extensions and sign in/download the STL extension, but each time I try either it get an "Authentication failure, contact the system administrator, reference # 751ace33-b2f9-431d-aac2-44607f9a9079 ". I was wondering if there was a simple fix. I am currently using Sketchup 2016 (64-bit).

Thank you for your time,


Before opening the Extensions window,… first sign in by clicking the little person icon on the lower left of the SketchUp application status bar.

Report back.

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