Download BCBtoolkitM3M4 https://www.dropbox.com/scl/fi/9yh4ss6gojat456wkren1/BCBToolKitOSXM3M4.zip?rlkey=hbezfb7w95tzczkorjz8fp911&dl=1

Install java https://adoptium.net/
Install FSL https://fsl.fmrib.ox.ac.uk/fsl/docs/#/install/macos

Remove the permission issue in the terminal
sudo xattr -dr com.apple.quarantine [BCBtoolkit application path]