Win 8.1 My game gives this error when I try to open it and I don't know how to solve it

[Mercena]

Project Reality Log File
PRLauncher.exe started at: 2023-04-16T19:28:30

Critical Error: An unhandled exception has occured. Details are as follows:

Método não encontrado: '!!0[] System.Array.Empty()'.

Further details can be found in the following file:

C:\Program Files (x86)\Project Reali...PRLauncher.log

Please report this error to the Project Reality Team, and include the log file in your report.

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 > System.MissingMethodException: Método não encontrado: '!!0[] System.Array.Empty()'.
   em Reality.Utils.Arguments.Parse(String[] , ICollection`1 , ICollection`1 )
   em -.f.OnStartup(StartupEventArgs a)
   em System.Windows.Application.<.ctor>b__1(Object unused)
   em System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   em MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

[[R-DEV]Mats391]

With this update we updated the requited .net Framework version to 4.7.2. Make sure this is installed on your system as Windows 8.1 does not come with it pre-installed.