This shows a GUI version of netpkg while installing.
Here we see two thunar file manager windows on Zenwalk where the active window shows the content of a Zenwalk CD.
The good old lilo still lives on Slackware and derivates like Zenwalk here. This shows a qemu shot of a dialog asking where to install the "Linux Loader" (lilo).
Here's a Zenwalk setup program. It's pretty much the same thing as in Slackware, with a few modifications visible later in the install process.
The image has been taken from qemu.