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Yes, all macOS machines must install that library in order to use the tk gui in python. The version that comes with macOS is quite old and buggy. According to the ActiveTCL license, I may not include it with Sigil itself on macOS.
I hope to include it in future versions of Sigil for macOS as I have built my own version directly from source without needing ActiveTCL.
Until then using the ActiveTCL installer is just easier for most people. It only has to be done once.
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