If you tried to join a webinar and hit this error, it means Windows is unable to update its internal certificate. This can be caused by many scenarios, but is easily resolved.

1. In the "Error - GoTo Opener" window, select Show log file.
2. Search the log file for the latest instance of https://builds.getgocdn.com:443/builds/g2m. This file should end with G2MCoreInstExtractor.exe.
   Note: An example of the file is https://builds.getgocdn.com:443/builds/g2m/18705/G2MCoreInstExtractor.exe.
3. Copy the file link and paste it in a new browser.

   Result: This will download the new file to your computer.

4. Once downloaded, open your Downloads folder, find and then right-click on the newly downloaded file.
5. From Properties > General > Security, select Unblock > Apply.
6. From Digital Signatures, select Details > View certificate to verify the "Valid from" dates have not expired.
7. Update as needed and then select OK.
8. Rejoin your meeting.