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Garmin Express - There was an error installing the update

Previous threads on this seem to be closed with no resolution, but I am getting this error trying to update maps on my Fenix 5.

I have done all the recommended steps, ensured there is sufficient space available on my watch, restarted Windows, reinstalled Express etc with no results. However I don't necessarily think it's an Express issue as such anyway as I was able to update maps on my Edge Tourer with no problem.

The logs show the following :-

Garmin.Omt.Service.Operation.Map.InvalidMapInstallException: Could not determine where to install the map.
at Garmin.Omt.Service.Operation.Map.Projector.ProjectMap(IDeviceMapUpdate update, IDetailedDevice device, IDeviceIO deviceIO, IMapContent content, IEnumerable\`1 softwareReinstalls)
at Garmin.Omt.Service.Operation.Map.Projector.<>c__DisplayClass1_0.<ProjectMapAsync>b__0()
at System.Threading.Tasks.Task\`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Garmin.Omt.Service.Operation.Map.UpdateMapOperation.<UpdateMapAsync>d__31.MoveNext()
--- End of stack trace from previous location where exception was thrown ---


Why express can't determine where to install the map I don't know, it should be fairly obvious. Anyone have any concrete suggestions how to resolve this?

Incidentally this forum doesn't seem to be able to correctly escape content from the logs in the preview.