An installation version for the Linux platform is available as a deb package (Debian, Ubuntu). In order to install the Questionnaire Editor in Ubuntu, type the following commands in the console:

sudo apt-get install xchm openjdk-8-jdk openjfx
wget http://www.cadas.pl/download/qet_4.98-1_amd64.deb
sudo dpkg -i qet_4.98-1_amd64.deb