Thank you for your suggestion.
As you indicated, after first installing Thetis 2.9.0.8 Pre-Release according to the wiki,
I downloaded and ran Thetis_x64_2_9_0_8-HL2-beta1.zip with the same error.
The error is.
Entry : 2:30:45 PM Sunday, June 25, 2023
Parameter is not valid.
---------stacktrace------------
at System.Drawing.Font.GetHeight(Graphics graphics)
at System.Drawing.Font.GetHeight()
at System.Drawing.Font.get_Height()
at System.Windows.Forms.Control.get_FontHeight()
at System.Windows.Forms.UpDownBase.get_PreferredHeight()
at System.Windows.Forms.UpDownBase.get_DefaultSize()
at System.Windows.Forms.Control..ctor(Boolean autoInstallSyncContext)
at System.Windows.Forms.ScrollableControl..ctor()
at System.Windows.Forms.ContainerControl..ctor()
at System.Windows.Forms.UpDownBase..ctor()
at System.Windows.Forms.NumericUpDown..ctor()
at Thetis.Setup.InitializeComponent()
at Thetis.Setup..ctor(Console c)
at Thetis.Console.get_SetupForm()
at Thetis.Console.ExitConsole()
at Thetis.Console.Dispose(Boolean disposing)
at System.ComponentModel.Component.Finalize()
-------------------------------
Ichiro JE1JGC