Some distributions of Linux do not have a deb or rpm tool. Trelis can be installed using the following method:
Download the .deb file.
# extract the contents of the .deb file
ar vx Trelis-14.0-Lin64-pro.deb
# install the data files (the files will go into /opt)
sudo tar -zx --directory=/ -f data.tar.gz
# extract the control files
tar zxvf control.tar.gz
# setup the license manager and desktop shortcuts
sudo ./postint