Hybrid Update Agent download fails

I installed the MSHybridService.msi via  https://aka.ms/hybridagentinstaller.

Then I started the HCW again and it wants to update itself. Unfortunately, this fails.

[...]
ERROR SUMMARY
	Below is a summary of the errors, details of these errors are listed later in the log.
	* Activation of C:\Users\xxxxx\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Microsoft Corporation\Microsoft Office 365 Hybrid Configuration Wizard.appref-ms| resulted in exception. Following failure messages were detected:
		+ Downloading https://hybridconfigwizard.azurewebsites.net/ClickOnce/Application Files/Microsoft.Online.CSE.Hybrid.Client_17_1_3902_0/ko/Microsoft.Online.CSE.Hybrid.Resource.resources.dll.deploy did not succeed.
		+ The remote server returned an error: (404) Not Found.
[...]
ERROR DETAILS
	Following errors were detected during this operation.
	* [19.11.2025 08:22:49] System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
		- Downloading https://hybridconfigwizard.azurewebsites.net/ClickOnce/Application Files/Microsoft.Online.CSE.Hybrid.Client_17_1_3902_0/ko/Microsoft.Online.CSE.Hybrid.Resource.resources.dll.deploy did not succeed.
		- Source: System.Deployment
		- Stack trace:
			at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
			at System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
			at System.Deployment.Application.FileDownloader.Download(SubscriptionState subState, X509Certificate2 clientCertificate)
			at System.Deployment.Application.DownloadManager.DownloadDependencies(SubscriptionState subState, AssemblyManifest deployManifest, AssemblyManifest appManifest, Uri sourceUriBase, String targetDirectory, String group, IDownloadNotification notification, DownloadOptions options)
			at System.Deployment.Application.ApplicationActivator.DownloadApplication(SubscriptionState subState, ActivationDescription actDesc, Int64 transactionId, TempDirectory& downloadTemp)
			at System.Deployment.Application.ApplicationActivator.InstallApplication(SubscriptionState& subState, ActivationDescription actDesc)
			at System.Deployment.Application.ApplicationActivator.ConsumeUpdatedDeployment(SubscriptionState& subState, ActivationDescription actDesc)
			at System.Deployment.Application.ApplicationActivator.PerformDeploymentUpdate(SubscriptionState& subState, String& errorPageUrl)
			at System.Deployment.Application.ApplicationActivator.ProcessOrFollowShortcut(String shortcutFile, String& errorPageUrl, TempFile& deployFile)
			at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl, Uri& deploymentUri)
			at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivationWithRetry(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
--- End of stack trace from previous location where exception was thrown ---
			at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
			at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivationWithRetry(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
			at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
		--- Inner Exception ---
		System.Net.WebException
		- The remote server returned an error: (404) Not Found.
		- Source: System
		- Stack trace:
			at System.Net.HttpWebRequest.GetResponse()
			at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)