Updates server seems to be giving 502s, causing fallback to the alt server which isn’t set up. Thread here.
C:\Program Files\Duplicati 2>Duplicati.Library.AutoUpdater.exe check
Error detected: System.Net.WebException: The remote server returned an error: (502) Bad Gateway.
at System.Net.WebClient.DownloadFile(Uri address, String fileName)
at Duplicati.Library.AutoUpdater.UpdaterManager.CheckForUpdate(ReleaseType channel)
Error detected: System.Net.WebException: The remote name could not be resolved: 'alt.updates.duplicati.com'
at System.Net.WebClient.DownloadFile(Uri address, String fileName)
at Duplicati.Library.AutoUpdater.UpdaterManager.CheckForUpdate(ReleaseType channel)
No updates found
C:\Program Files\Duplicati 2>