I download the .deb 64 bit image in their homepage, untar and install. Launching the app by the icon is unsuccessful and also in terminal
/opt/XnView/XnView: error while loading shared libraries: libgstapp-0.10.so.0: cannot open shared object file: No such file or directory
I do not want to add third-party repositories to my system like in the proposal of the thread for 14.04, since the official image must work if at all. I forwarded this thread already to the developer.