SLI (Slackel-Live installer) is a GUI to install on internal or external SSD disk or USB stick or copy the live system  on a USB stick (frugal installation) (based on GTK+2).
It is written in C, glade and gtk.
Slackware-live is a dependency for SLI.

The SLKBUILD source package and binary can be found on http://www.slackel.gr/repo/source/slackel-source/slackware-live-installer-1.2.5/
To build the package fakeroor slkbuild -X
To install the package sudo spkg sli-1.2.5-x86_64-11dj.txz or sudo installpkg sli-1.2.5-x86_64-11dj.txz

If you want to build from the source in hrere in git:
SLI use the CMake construction system. So, cmake has to be installed if it is not ( sudo slapt-get -u && sudo slapt-get -i cmake)

The installation procedure is:
1) download the sources
git clone https://github.com/djemos/slackel-live-installer.git
2) cd slackel-live-installer
3) sh maketxz.sh
4) Install the package
sudo spkg sli-1.2.5-x86_64-11dj.txz or sudo installpkg sli-1.2.5-x86_64-11dj.txz

Copyright (C) 2014-2022 Dimitris Tzemos <dijemos@gmail.com>
This program is free software: you can redistribute it and/or modify it under the terms 
of the GNU General Public License as published by the Free Software Foundation, 
either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty 
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License at <http://www.gnu.org/licenses/> for more details.