On this moment, Cantor can't have portable version. Even more, Cantor actually can't work correctly, if on build step CMAKE_INSTALL_PREFIX is setted to non standart location (for example to /opt).

So, we should, first, fix problem with installing on unstandart location, and, second, add posibility to use portable Cantor, because as KDE Education project, we partically targets on students audience and many of computers in schools/universities doesn't give possiblity to install external programs to the pupils.