$ ar xv waveform_64bit_v11.1.0.deb
$ sudo tar xvf data.tar.xz -C /
The first command extracts the contents of the *.deb file. The second extracts the Waveform data archive into the root of your system. The Waveform11 binary ends up in /usr/bin/. If the launcher doesn't show up in your menus anywhere, you can launch it using a terminal (note the capital "W").
$ Waveform11