Made a special version of KCC that doesn't require `7z`, using `tar` instead for extracting which is built into macOS since 2009 and Windows 10 since 2017.
https://github.com/axu2/kcc/releases/tag/v6.0.0-tar
This is especially important on macOS, since installing homebrew and Xcode to install 7z is a lot to ask for a new user.
(Of course, if tar isn't available then it still asks for 7z as fallback.)