You could:
go to the code tab at https://sourceforge.net/p/s7commwireshark/code/HEAD/tree/;
clone the repository;
download the Wireshark 3.4.7 source, so the Wireshark header files are available, if you haven't done so already;
run the tools/macos-setup.sh script in the Wireshark source tree, so the header files for the support libraries are available, if you haven't done so already;
make sure you have Xcode installed;
build it;
install it in the appropriate directory;
but we don't have a tutorial on doing that, so you'd have to figure it out yourself or keep asking questions.
Another semi-automated way, without setting up a local build system is:
- clone locally, create a new branch, manually incorporate the dissector, push the new branch
- the github workflow for macos compiles the branch including the dissector and creates binary distribution for it.
IT *should* give you a working mac bin package, despite I've never tested it. However if it works, it gives you a dmg without the hassle of a local build env.
