Package install does not add it to the menus in KDE and possibly to other DEs menus

[msdobrescu]

I have an old MOS KDE installation, from the times when MOS Startup was not yet available to the ISO.
I have installed it and it starts, including the welcome page, but it is not added to KDE's menu.
I have installed a new Gnome ISO that comes with it and has it in the apps list there. I have uninstalled it and it was removed from the apps list. Unfortunately, could not add it back under Gnome due to this:

luet install apps/mocaccino-statusbar
 Luet version 0.17.0-g29ec19a8a137fd28585c04713d8708d6759a45f3 2021-07-12 0841 UTC
 
	Luet Copyright (C) 2019-2021 Ettore Di Giacinto
	This program comes with ABSOLUTELY NO WARRANTY.
	This is free software, and you are welcome to redistribute it
	under certain conditions.
	
⣻  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⢿  Repository mocaccino-repository-index is already up to date.
 ℹ Repository: mocaccino-repository-index Priority: 1 Type: http
⡿  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⣟  Repository luet-official is already up to date.
 ℹ Repository: luet Priority: 1 Type: http
⣷  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⣾  Repository mocaccino-desktop is already up to date.
⢿  ℹ Repository: mocaccino-desktop Priority: 3 Type: http
⣟  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⣷  Repository mocaccino-extra is already up to date.
 ℹ Repository: mocaccino-extra Priority: 2 Type: http
⣽  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⣻  Repository kernel-repo is already up to date.
⣻  ℹ Repository: mocaccino-kernel Priority: 3 Type: http
⢿  Downloaded repository.yaml of 0.00 MB ( 0.00 MiB/s )
⣟  Repository mocaccino-os-commons is already up to date.
⡿  ℹ Repository: mocaccino-os-commons Priority: 2 Type: http
 🤔  Checking for available upgrades
 Nothing to do
 Packages that are going to be installed in the system: 
  mocaccino-statusbar-apps-0.4.2+20 (mocaccino-desktop)
 By going forward, you are also accepting the licenses of the packages that you are going to install in your system.
 Do you want to continue with this operation? [y/N]: 
y
 Failed downloading package mocaccino-statusbar Error on download artifact: server returned 404 Not Found