System Update fails to download updates

Question

SU returns an error saying "An error occurred while downloading packages.". I reinstalled SU, Solution Center etc. to no avail. It used to work but now it's failing consistently... What to look for or to change to get it back?
Thanks in advance.
SU version 5.03.008 on Windows 8.1 64 bit
Solved!
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Answer 1

Thanks for your help. Here are the lines where the error occurs:
Info    2014-02-07 , 10:19:31
    at Tvsu.FileDownloader.HttpsDownload.GetProxy(ConnectionSettingsBean connBean)
    Message: Connection type set to DIRECT in ConnectionSettingsBean
Severe    2014-02-07 , 10:19:31
    at Tvsu.FileDownloader.HttpsDownload.Init(FileDownloadInfo fileInfo)
    Message: Debug Log: Init method:GET
Info    2014-02-07 , 10:19:31
    at Tvsu.Engine.Process.HelloProcess.Start()
    Message: UDF download status is -> Downloaded
Info    2014-02-07 , 10:19:31
    at Tvsu.Engine.Process.HelloProcess.ParseUDF(String udfPath)
    Message: Parsing the UDF file
Severe    2014-02-07 , 10:19:31
    at Tvsu.Engine.Process.HelloProcess.Start()
    Message: Error reading C:\ProgramData\Lenovo\SystemUpdate\session\system\SSClientCommon\HelloLevel_9_08_00.xml, this XML file is not well-formed
    Exception:
        Message: Root element is missing.
        Type: System.Xml.XmlException
           at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space)
   at System.Xml.XPath.XPathDocument..ctor(TextReader textReader)
   at Tvsu.Engine.Process.HelloProcess.ParseUDF(String udfPath)
   at Tvsu.Engine.Process.HelloProcess.Start()
Info    2014-02-07 , 10:19:31
    at Tvsu.Egather.EgatherManager.GetEgatherParser(String type)
    Message: Running egather minimal.....
Info    2014-02-07 , 10:19:31
    at Tvsu.Egather.EgatherExecutor.RunAsWindowsService(String directory, String command, String arguments)
    Message:  /execute ia.exe /arguments -filename"""C:\Program Files (x86)\Lenovo\System Update\egather\sysrecomin""" -probes REGIONAL_SETTINGS GATHERER_INFORMATION SYSTEM_SUMMARY -local /directory C:\Program Files (x86)\Lenovo\System Update\egather\ /type COMMAND /timeout 300000
Info    2014-02-07 , 10:19:31
    at Tvsu.Egather.EgatherExecutor.RunAsWindowsService(String directory, String command, String arguments)
    Message: FileName Path: C:\Program Files (x86)\Lenovo\System Update\TvsuCommandLauncher.exe
And then:
Info    2014-02-07 , 10:19:34
    at Tvsu.ConnectionSettings.ConnectionSettings.GetConnectionForURL(String url)
    Message: Connection settings bean found for download.lenovo.com
Info    2014-02-07 , 10:19:34
    at Tvsu.FileDownloader.HttpsDownload.GetProxy(ConnectionSettingsBean connBean)
    Message: Connection type set to DIRECT in ConnectionSettingsBean
Severe    2014-02-07 , 10:19:34
    at Tvsu.FileDownloader.HttpsDownload.Init(FileDownloadInfo fileInfo)
    Message: Debug Log: Init method:GET
Info    2014-02-07 , 10:19:35
    at Tvsu.Engine.Process.HelpCenterQuestProcess.GetCatalogFileLocation(String catalogDescritorFile)
    Message: Catalog file server path = https://download.lenovo.com/catalog//2355_Win8.xml, local path = C:\ProgramData\Lenovo\SystemUpdate\session\2355_Win8.xml, CRC = 0ce3cef34579574cfad468b8f00c5871e97deed53f5027dafd9db079218330f5
Severe    2014-02-07 , 10:19:35
    at Tvsu.Engine.Process.HelpCenterQuestProcess.LaunchHelpCenterProcess()
    Message: An error ocurred while contacting the help center
    Exception:
        Message: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.
        Type: System.InvalidOperationException
           at System.Security.Cryptography.SHA256Managed..ctor()
   at Tvt.Util.CrcGenerator.GetSHA256Hash(String fileName)
   at Tvsu.Engine.Process.HelpCenterQuestProcess.DownloadCatalogFile()
   at Tvsu.Engine.Process.HelpCenterQuestProcess.LaunchHelpCenterProcess()
Info    2014-02-07 , 10:19:35
    at Tvsu.Engine.Task.Task.Start()
    Message: Executing the PostProcess HelpCenterQuestProcess
Severe    2014-02-07 , 10:19:35
    at Tvsu.Engine.Task.Task.StartExecution()
    Message: An error occurred while the task: ApplicableUpdatesTask executed the process: HelpCenterQuestProcessthe message from exception isException of type 'Tvt.FileDownloader.DownloadException' was thrown.
    Exception:
        Message: Exception of type 'Tvt.FileDownloader.DownloadException' was thrown.
        Type: Tvt.FileDownloader.DownloadException
           at Tvsu.Engine.Task.Task.Start()
   at Tvsu.Engine.Task.Task.StartExecution()
Info    2014-02-07 , 10:19:35
    at Tvsukernel.CustomControls.Step.<>c__DisplayClass7.<set_Image>b__6()
    Message: Setting FAILED status.
Info    2014-02-07 , 10:19:35
    at Tvsukernel.Logic.GUIController.ShowErrorMessage(Exception e)
    Message: Error while downloading packages.
    Exception:
        Message: Exception of type 'Tvt.FileDownloader.DownloadException' was thrown.
        Type: Tvt.FileDownloader.DownloadException
           at Tvsu.Engine.Task.Task.StartExecution()
   at Tvsu.Sdk.SuSdk.GetApplicableUpdates(searchingFolderDelegate spd, showErrMsgDelegate sed)
   at Tvsukernel.Logic.ProgressThread.InitSearch()
Info    2014-02-07 , 10:19:35
    at Tvsukernel.Dialogs.Messages.ShowStaticMessage(String message, String title, MessageType t, Boolean check)
    Message: Showing ERROR Message: < An error occurred while downloading packages. >