To answer your question, there is "pkgtool" which is a menu driven program for installing / removing slackpacks, that is files with either the .tgz, or the newer .tzx file extension. I just used it to install VLC media player, and it worked like a champ the first time.. The pkgtool command is issued from a terminal window, or the command line, and it opens the menu. You must be logged in as Root to run this command. The Slackbook 2.0 pdf file describes it on page 217.Are there no Graphical installers? Even unofficial ones like Pamac for Arch?