Hi,
Yes, it seems your Mac OSX python is missing pieces. If you go to the Sigil Release page you will see a Note for Mac OS users to download and install the ActiveState's ActiveTCL free community edition. Once you have that installed, please use the Manage Plugins menu and check the UseBundled Python box. That will allow Sigil to load and use tk properly.
Please let me know if you run into any difficulties.
KevinH
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