The 2nd link fixed it for me, though I don't know why in the world port 443 from WAC would be interfering with the install.

I tried to install Otter via Hub using an existing SQL server and IIS. I had problems getting it to work (the Otter page was just a blank white page). I decided to simplify because I'm really just evaluating. Thus I decided to uninstall everything and start over, using free license, the same existing SQL server, and the integrated web server.
I am having problems.
I uninstalled Otter using Hub. I uninstalled Hub using programs/features. I removed all Inedo and Otter folders in program files, program files (x86), and programdata. I removed the upack folder from programdata. I looked for registry settings but they all seemed to have already been deleted. I deleted the Otter Service service. I rebooted.
I have done this twice now.
Hub installs fine. When installing Otter using Hub:
I get "Something went wrong during installation."
It seems to get a long way through, including creating the Otter database on my existing SQL server.
Here is the end of the error report:

** Reserving URLs **
** Ensure that $trimmedUrl is registered to $svcUserAccount **
DEBUG: Finding current reservations for http://*:8626/...
ERROR: Unhandled exception: System.ArgumentException: The SDDL form of a security descriptor object is invalid.
Parameter name: sddlForm
at System.Security.AccessControl.RawSecurityDescriptor.BinaryFormFromSddlForm(String sddlForm)
at Inedo.Web.Server.HttpApi.HttpApiInternal.QueryReservations()
at Inedo.Web.Server.HttpApi.GetAllReservations()
at Inedo.Extensions.Installer.Operations.EnsureUrlReservationOperation.RemoteConfigureAsync(IRemoteOperationExecutionContext context)
at Inedo.Extensibility.Operations.RemoteEnsureOperation.RemoteConfigureJob.<ExecuteAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Inedo.Extensibility.Operations.RemoteOperationJob.<ExecuteAsync>d__13.MoveNext()
ERROR: Exception of type 'Inedo.ExecutionEngine.Executer.ExecutionFailureException' was thrown.