Get Windows binaries here:
https://ffglitch.org/pub/bin/win64/ffglitch-0.9.4-win64.7z

Get Linux binaries here:
https://ffglitch.org/pub/bin/linux64/ffglitch-0.9.4-linux64.7z

Get macOS binaries here:
https://ffglitch.org/pub/bin/mac64/ffglitch-0.9.4-mac64.7z

You probably don’t need to build FFglitch from source code, but if you really insist, here it is:
https://ffglitch.org/pub/src/ffglitch-0.9.4.tar.xz

… or get the latest source code from the github repository:
https://github.com/ramiropolla/ffglitch-core/tree/ffedit-0.9