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A few things ...
1. The correct Python is already part of Sigil on macOS and no additional Python installation is needed by Sigil. Please uninstall whatever version of Python you installed unless you need it for some other reason.
2. Some plugins are platform specific and will not run on macOS. Could it be a Windows only plugin?
3. If he/she tried to manually install a plugin by unpacking it in the wrong place they will have to manually remove what ever they did.
4. The Sigil plugin preferences check box for use embedded Python should always be checked on macOS as that one has the required pieces. That is the default setting and it should not be changed.
Also MacOS many users has set a Mac Preference to "open safe files" after download or some similar wording. This results in the zip archive being unzipped automatically. In addition, the macOS gatekeeper marks downloaded files to quarantine them.
So the best procedure for macOS is to:
1. Make sure to uncheck the Mac preference to open safe files after download first
2. Download the plugin and it should appear a true zip file in the Mac Downloads folder
3. ***Do Not skip this step*** Manually drag and drop that plugin zip archive from the Downloads folder to the Desktop. This tells macOS gatekeeper that you recognize the file so it will loosen its quarantine. Never try to run or install anything directly from the macOS Downloads folder. Macs restrict that for extra protection.
4. Use Sigil Manage Plugins to install the plugin from the Desktop folder.
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