Thanks for the help, Kevin.
Some progress, but not quite there yet!!
I was finally able to delete the previous installation. I could not find the app in Finder at first, but eventually found it in a folder called MacPorts which also contained the Python Launcher.
I deleted the Sigil app from there and reinstalled by dragging the sigil app to the applications folder in Finder.
This time I was able to check the box to use the bundled Python .
The AccessAide and TestPlugin worked.
But the Epubcheck plugin gave this error message.
====
Running EPUBCheck 5.0.0... please wait.
Traceback (most recent call last):
File "/Applications/Sigil.app/Contents/plugin_launchers/python/launcher.py", line 142, in launch
self.exitcode = target_script.run(container)
File "/Users/jhswi/Library/Application Support/sigil-ebook/sigil/plugins/EpubCheck/plugin.py", line 506, in run
parsed_json = json.loads(stdout)
File "json/__init__.py", line 346, in loads
File "json/decoder.py", line 337, in decode
File "json/decoder.py", line 355, in raw_decode
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Error: Expecting value: line 1 column 1 (char 0)
Running EPUBCheck 5.0.0... please wait.
Traceback (most recent call last):
File "/Applications/Sigil.app/Contents/plugin_launchers/python/launcher.py", line 142, in launch
self.exitcode = target_script.run(container)
File "/Users/jhswi/Library/Application Support/sigil-ebook/sigil/plugins/EpubCheck/plugin.py", line 506, in run
parsed_json = json.loads(stdout)
File "json/__init__.py", line 346, in loads
File "json/decoder.py", line 337, in decode
File "json/decoder.py", line 355, in raw_decode
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Error: Expecting value: line 1 column 1 (char 0)
=====
I think I must have done something weird the first time I installed it and some side effects are lingering perhaps.
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