Problems installing vlc, 7-zip and unrar in qubes 4.3.1

Hello, not sure if i put this in the right place, i just installed qubes 4.3.1, i’m trying to install the aforementioned software, but i can’t seem to be able to do it, i can’t use sudo from the whonix18 terminal like i could before, i have to go through dom0 terminal first, from there i try to install that stuff and i just can’t seem to be able to use the software i just installed.
I probably installed in the wrong place like an idiot, but i can’t figure it out and it’s driving me nuts.
Can someone tell me what syntax to use and maybe explain to me what to do like i’m a particularly daft 5 years old?

where you wan’t to install it… QubesOS is not one system. It’s a multi machine system. Each qube/VM is separate machine and in each you install apps separatelly.
So where you wan’t to install them again?

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