I really am sorry I assumed you were using the latest version of HARK, 2.4.
harktool5-GUI works with HARK2.4 or later.
Do you think you can update HARK to the latest version?
By the way, I just want to make sure to avoid any more misunderstanding.
The harktool5 that you are talking about is harktool5-GUI, not harktool5-CUI.
Yuka, HARK Support Team