Have you also found the menu entry? -- Hint:'sound and video'
..don't know why but it always has been in a 'multimedia' category.
Porteus 5.01-x86_64-Cinnamon + all updates

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sudo -S sed -i 's^=AudioVideo;^=System;AudioVideo;^' /usr/share/applications/isomaster.desktop
Me too.
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~# uname -a
Linux porteus.example.net 6.6.11-porteus #1 SMP PREEMPT_DYNAMIC Sun Jan 14 12:07:37 MSK 2024 x86_64 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz GenuineIntel GNU/Linux
~# cat /etc/porteus/*
001-core.xzm:20231229
002-xorg.xzm:20231229
002-xtra.xzm:20231229
003-cinnamon.xzm:20231229
initrd.xz:20230923
~# ls -l /mnt/live/memory/images
000-kernel.xzm : Jan 14 04:14
001-core.xzm : Dec 28 22:50
002-xorg.xzm : Dec 28 22:56
002-xtra.xzm : Dec 28 22:58
003-cinnamon.xzm : Dec 29 00:05