What happens if you write that command in terminal ? What game/app are you trying to install ?
This is the first day I have been using the Zorin system, trying to run simple horror games
I would suggest Lutris, much easier and it's not using flatpak.
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I didn't know that Lutris was in the store, thanks
Download it from their website. you get the latest version
Your first screenshot infers a software install/update did not complete correctly. To rectify this in a terminal enter:
sudo dpkg --configure -a
If you haven't done so already I advise you make sure your Software updates are pulled from Main Server and not your country locale server where you reside.