All software downloaded from the repositories using Synaptic or Muon
goes into /var/cache/apt/archives/. There are quite a few command line
programmes and they do not appear on the menu. Generally "consumer
oriented" software like Office and Browser apps appear on the menus
but also many niche programmes.

If you can't find it on the menus it might appear after a reboot
(faint hope though!). You can find the names of all the files
installed for each app in Synaptic. Look for what is most likely to be
the main executable and type it in a terminal programme. If it was
really properly installed this will enable you to start it, although
you may have to try more than on name to find the main executable.