How to install on ubuntu (for others use your package installer):

1. install hopper debian package normally (usually on /opt) $ sudo apt install Hopper-v4-4.5.29-Linux.deb
2. copy crack executable using (defaults from crack folder) $ sudo cp Hopper /opt/hopper-v4/bin
3. (optional, but easier to run) create a link to /us/local $ sudo ln -s /usr/local/bin/Hopper /opt/hopper-v4/bin/Hopper
4. run it $ Hopper&