every time i open the exe file, it crashes instantly

version: 1.10.5

error log:

Source: EasyFPSEditor_CE

Reason: Method not found: 'Int64 System.DateTimeOffset.ToUnixTimeSeconds()'.

Stack trace:    at EasyFPSEditor15.MainForm.MainFormLoad(Object sender, EventArgs e)

   at System.Windows.Forms.Form.OnLoad(EventArgs e)

   at System.Windows.Forms.Form.OnCreateControl()

   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)

   at System.Windows.Forms.Control.CreateControl()

   at System.Windows.Forms.Control.WmShowWindow(Message& m)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)

   at System.Windows.Forms.ContainerControl.WndProc(Message& m)

   at System.Windows.Forms.Form.WmShowWindow(Message& m)

   at System.Windows.Forms.Form.WndProc(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

You need to have .net framework 4.6 or later installed.  
Here's a download link to for the latest version: https://dotnet.microsoft.com/en-us/download/dotnet-framework/thank-you/net481-web-installer