Using MepisLinux updated to Debian testing/unstable. Downloaded autopackage. Followed the online instructions about setting permissions and opening it. Nothing happened - no installation, nothing.

Downloaded the .bz2 version. It would not untar from command line, but Konqueror was able to open the archive and I was able to manually copy the xaralx folder inside it to my home folder. From there, XaraLX ran just fine.

Never encountered this autopackage thing before, much prefer standard DEB or RPM packages.