I finally got to a Windows machine and used Rufus. It required Syslinux 6.02(?) to put the iso on the drive properly. After burning it, I did try it to see if it worked. I was greeted with a 4.2 livecd running. It seems the other burning options fail with the Syslinux bit.
Some of my info could most definitely be wrong. Unless your concern is storage space, I would go ahead and try installing software from synaptic. If it doesn't work you can always look/ask for help. I am sure it would be preferred if you try to find the answer on the interweb yourself, first.
When you install via synatpic or apt-get, deb files 'should' pull in all required libs(libraries) and any other files. You can use qt based applications too. Just realize you will pull in a whole batch of other things, if you haven't installed something already that requires the the extra files to run. By all means go ahead and select the app you want. See how many extra files are pulled in when you choose it.
Wholly unrelated, sort of. A guy at church has a Prusa i3 3d printer and he updated Cura, software to generate gcode for the printer. The software update actually got rid of or completely ignored his earlier config settings. Long story short, I wonder if a software update either got rid of or completely ignored your old config settings for your printer.