(Post updated on 3/26/2020 to add more information about installation process)
We wanted to let you know that we are releasing what we consider a significant update to Exchange Hybrid Configuration...
Updated Mar 26, 2020
Version 5.0
Blog Post
Thanks for the detailed error message about HCW 8064 error 
2020.03.20 07:53:54.177 *ERROR* 10133 [Client=UX, Page=Configuring, fn=RunWorkflow, Workflow=Hybrid, Task=IntraOrganization, Phase=Configure, Step=OAuth, Thread=16]
Graph service call (Graph API) has failed with the exception: System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at Microsoft.Online.CSE.Hybrid.Common.GraphServicePrincipalProvider.UpdateSPN(String[] acceptedDomains, String[] servicePrincipalNames, X509Certificate2 authCertificate)
at Microsoft.Online.CSE.Hybrid.StandardWorkflow.IOCConfigurationTask.UpdateGraphSPN(ILogger logger, String[] acceptedDomains, String[] servicePrincipalNames, IExchangeCertificate certificate, IGraphService graphService)
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].