[troubledMan]

Thanks Doitsu.

After install Tcl, when I use the plugin, the log now is the following:

Status: failed

Traceback (most recent call last):
File "/Applications/Sigil.app/Contents/plugin_launchers/python/launcher.py", line 141, in launch
target_script = __import__(script_module)
File "/Users/####/Library/Application Support/sigil-ebook/sigil/plugins/KindleGen/plugin.py", line 25, in <module>
from tkinter import Tk, BOTH, StringVar, IntVar, BooleanVar, PhotoImage, messagebox, DISABLED
File "tkinter/__init__.py", line 36, in <module>
ImportError: dlopen(/Applications/Sigil.app/Contents/Frameworks/Python.framework/Versions/3.8/lib/python3.8/lib-dynload/_tkinter.cpython-38-darwin.so, 0x0002): Library not loaded: /Library/Frameworks/Tcl.framework/Versions/8.6/Tcl
Referenced from: /Applications/Sigil.app/Contents/Frameworks/Python.framework/Versions/3.8/lib/python3.8/lib-dynload/_tkinter.cpython-38-darwin.so
Reason: tried: '/Library/Frameworks/Tcl.framework/Versions/8.6/Tcl' (no such file), '/System/Library/Frameworks/Tcl.framework/Versions/8.6/Tcl' (no such file)
Error: dlopen(/Applications/Sigil.app/Contents/Frameworks/Python.framework/Versions/3.8/lib/python3.8/lib-dynload/_tkinter.cpython-38-darwin.so, 0x0002): Library not loaded: /Library/Frameworks/Tcl.framework/Versions/8.6/Tcl
Referenced from: /Applications/Sigil.app/Contents/Frameworks/Python.framework/Versions/3.8/lib/python3.8/lib-dynload/_tkinter.cpython-38-darwin.so
Reason: tried: '/Library/Frameworks/Tcl.framework/Versions/8.6/Tcl' (no such file), '/System/Library/Frameworks/Tcl.framework/Versions/8.6/Tcl' (no such file)

I've followed the link you kindly wrote, so I don't understand the log's last part (Reason:...)
In fact, I think they both are the same.