Problem installing COB

When I try to install a message box pops up as follows

Cannot download the application.
The application is missing required files.
Contact application vendor for assistance.

Here is a printout of the log file

PLATFORM VERSION INFO
Windows : 6.0.6001.65536 (Win32NT)
Common Language Runtime : 2.0.50727.3074
System.Deployment.dll : 2.0.50727.3053 (netfxsp.050727-3000)
mscorwks.dll : 2.0.50727.3074 (QFE.050727-3000)
dfdll.dll : 2.0.50727.3053 (netfxsp.050727-3000)
dfshim.dll : 2.0.50727.3053 (netfxsp.050727-3000)

SOURCES
Deployment url : http://download.comodo.com/cob/download/Comodo.Backup.application
Server : nginx
Deployment Provider url : http://download.comodo.com/cob/download/Comodo.Backup.application

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed later in the log.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS
There were no warnings during this operation.

OPERATION PROGRESS STATUS

ERROR DETAILS
Following errors were detected during this operation.

  • [12/08/2009 12:38:54] System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
    • Downloading http://download.comodo.com/cob/download/Comodo.Backup.application 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)
      at System.Deployment.Application.DownloadManager.DownloadManifestAsRawFile(Uri& sourceUri, String targetPath, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
      at System.Deployment.Application.DownloadManager.DownloadManifest(Uri& sourceUri, String targetPath, IDownloadNotification notification, DownloadOptions options, ManifestType manifestType, ServerInformation& serverInformation)
      at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirect(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
      at System.Deployment.Application.DownloadManager.FollowDeploymentProviderUri(SubscriptionStore subStore, AssemblyManifest& deployment, Uri& sourceUri, TempFile& tempFile, IDownloadNotification notification, DownloadOptions options)
      at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
      at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(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)

COMPONENT STORE TRANSACTION DETAILS
No transaction information is available.

There was some error on download server, and it was fixed the next day. You can try installing COB again.