Getting installation Error while installing ASP.NET AJAX

[Iustinian]

Telerik.CommonInstaller.ProductInfoService.ProductInfoServiceException: Failed to retrieve ValidationVersion.xml from ProductInfoService. ---> System.EntryPointNotFoundException: Unable to find an entry point named 'GetCurrentPackageId' in DLL 'kernel32.dll'.
   at Microsoft.Win32.UnsafeNativeMethods._GetCurrentPackageId(Int32& pBufferLength, Byte[] pBuffer)
   at Microsoft.Win32.UnsafeNativeMethods._IsPackagedProcess()
   at Microsoft.Win32.UnsafeNativeMethods.<.cctor>b__0()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at System.Xml.Serialization.TempAssembly.LoadGeneratedAssembly(Type type, String defaultNamespace, XmlSerializerImplementation& contract)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
   at Telerik.CommonInstaller.ProductInfoService.ProductInfoService.DeserializeRemoteObject[T](String sourceUri, String sourceName)
   --- End of inner exception stack trace ---
   at Telerik.CommonInstaller.ProductInfoService.ProductInfoService.DeserializeRemoteObject[T](String sourceUri, String sourceName)
   at Telerik.CommonInstaller.ProductInfoService.ProductInfoService.get_WebInstallerValidationVersion()
   at Telerik.CommonInstaller.Application.Services.DeprecationService.GetWebInstallerMinVersion()
   at Telerik.CommonInstaller.Application.Services.DeprecationService.CheckWebInstallerDeprecated()
   at Telerik.CommonInstaller.WebInstaller.App.CheckIsDeprecated()
   at Telerik.CommonInstaller.InstallerUIBase.ApplicationBase.OnStartup(StartupEventArgs e)
   at Telerik.CommonInstaller.WebInstaller.App.OnStartup(StartupEventArgs e)
   at System.Windows.Application.<.ctor>b__1(Object unused)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

[Vesko]

Hi Iustinian,

Thank you for contacting us.

It seems there is a connectivity issue. Could you check if there are any network restrictions on your side that may prevent the access to www.telerik.com?

Meanwhile you can use the offline installers (LINK).

Regards,
Vesko
Telerik