Mac OS X Notes
Attention Mac OS X Users
The latest version of Sigil requires macOS 10.11 or higher. macOS upgrades are available for free directly from Apple.
Per the recommendation of www.python.org (see https://www.python.org/download/mac/tcltk/), due to bugs and the age of Apple's internal Tcl library, you should also download and install ActiveState's ActiveTcl Community Edition. To get the latest bug fixes, Sigil-0.x.x's embedded Python has been linked with the very latest version of Tcl 8.6.x.x
We may not redistribute this Package with Sigil due to ActiveState's binary non-redistribution policy.
So please, if you have not already done so download and install this version of ActiveState's Active Tcl Community Edition, until we get a chance to do our own build of Tcl from source for future releases. ActiveState is a primary contributor to www.python.org and a respected and trusted source for python and tcl/tk related binaries on both Windows and Mac OS X.
See: http://www.activestate.com/activetcl/downloads Version: 188.8.131.52 or later 8.6.X release