Problem installing upgrade Trados Studio 2021

I get an error when trying to install Trados Studio 2021.

The following message appears:

An error ocurred and the program was aborted. you can try running the program again but if the same problem repeats, please generate a debug log (usually found in C:\ProgramData\SDL\Chainer\Logs) and contact technical support.

Log-file is attached.

Can someone let me know how to solve this?.

Thanks in advance.

Kind regards,

Luc


2021-04-20 14:59:33,317 INFO  : Logging started. 
2021-04-20 14:59:33,321 INFO  : Sdl.Tools.Chainer.ProgramOptions:
Base: Sdl.Tools.Chainer.ProgramOptions
Help switch present: False
Error text: 
Options:
  [task, install]
  [suite, TradosStudio.Suite]
  [uilevel, all]
  [noconsole, ]
  [loglevel, all]
Arguments:

Task: Installation
UILevel: All
Suite path: C:\ProgramData\Package Cache\SDL\SDLTradosStudio2021SR1\TradosStudio.Suite
Response path: 
Logger directory: C:\ProgramData\SDL\Chainer\Logs
Logger level: ALL
MSI log level: Verbose
Confirm ? no 
2021-04-20 14:59:33,356 INFO  : Loading version 1.8 suite. 
2021-04-20 14:59:35,086 INFO  : Running data collection stage. 
2021-04-20 14:59:41,136 INFO  : Datastore after collector finished was:  
2021-04-20 14:59:41,138 INFO  : Sdl.Tools.Chainer.SymbolTableStack
[SuiteDir, C:\ProgramData\Package Cache\SDL\SDLTradosStudio2021SR1]
[PackageCacheFolder, C:\ProgramData\Package Cache]
[ModulesDir, C:\ProgramData\Package Cache\SDL\SDLTradosStudio2021SR1\modules]
[DependencyModulesDir, C:\ProgramData\Package Cache\SDL\Dependencies]
[ProgramFilesFolder, C:\Program Files (x86)]
[StudioFolder, C:\Program Files (x86)\SDL\SDL Trados Studio\Studio16]
[HasSetLicenseUI, True]
[AcceptedLicenseAgreement, True] 
2021-04-20 14:59:41,138 DEBUG : Sdl.Tools.Chainer.SymbolTableStack
[SuiteDir, C:\ProgramData\Package Cache\SDL\SDLTradosStudio2021SR1]
[PackageCacheFolder, C:\ProgramData\Package Cache]
[ModulesDir, C:\ProgramData\Package Cache\SDL\SDLTradosStudio2021SR1\modules]
[DependencyModulesDir, C:\ProgramData\Package Cache\SDL\Dependencies]
[ProgramFilesFolder, C:\Program Files (x86)]
[StudioFolder, C:\Program Files (x86)\SDL\SDL Trados Studio\Studio16]
[HasSetLicenseUI, True]
[AcceptedLicenseAgreement, True] 
2021-04-20 14:59:41,154 INFO  : Running system alteration stage. 
2021-04-20 14:59:41,247 INFO  : Registering Setup with ARP 
2021-04-20 14:59:41,465 INFO  : Package 'Microsoft Visual C++ 2019 Redistributable' should be installed. 
2021-04-20 15:00:14,341 FATAL : Sdl.Tools.Chainer.ExpressionEvaluator+InterpreterException: The expression threw an exception.
Chainer.ProductInfo.Family(new Guid("{65E5BD06-6392-3027-8C26-853107D3CF1A}")).FirstOrDefault() != null &&
          new Version(Chainer.ProductInfo.Family(new Guid("{65E5BD06-6392-3027-8C26-853107D3CF1A}")).First().VersionString) >= new Version(14, 26, 28720) ---> System.ArgumentNullException: Waarde kan niet null zijn.
Parameternaam: input
   bij System.Version.Parse(String input)
   bij System.Version..ctor(String version)
   bij Evaluator.Evaluate(Object[] args)
   --- Einde van intern uitzonderingsstackpad ---
   bij Sdl.Tools.Chainer.ExpressionEvaluator.Evaluate(String codeFragment, Object[] argumentValues, AssemblyReferences references, ParameterList parameterList, Type resultType)
   bij Sdl.Tools.Chainer.Expression`1.Evaluate(Object[] argumentValues)
   bij Sdl.Tools.Chainer.Packages.ExecutablePackage.IsInstalled()
   bij Sdl.Tools.Chainer.Packages.ExecutablePackage.Install()
   bij Sdl.Tools.Chainer.ChainerSteps.InstallStep.Launch(WorkflowBase workflow, WorkflowDirection previousDirection)
   bij Sdl.Tools.Chainer.Workflows.SystemAlterationWorkflow.Run()
   bij Sdl.Tools.Chainer.Task.Perform(Suite suite)
   bij Sdl.Tools.Chainer.Program.Execute()
   bij Sdl.Tools.Chainer.Program.Main() 
2021-04-20 15:00:14,341 INFO  : Logging ended.