Maybe they downloaded the zip and then immediately tried to open it in a specific program through the open dialog giving them an error. I see similar mistakes with my parents - they have no concept of where files are, it’s just “on the computer” because they rely so heavily on “smart” file picker dialogs that show you everything recent or by a file type no matter where it’s actually located.
I’m 99% sure that account is a troll. They previously argued with me that an Asus router can do everything a business grade firewall like opnsense could do, then proceeded to stick their head in the sand and provide no counter when I pointed out several limitations of consumer router hardware and features that even replacing stock firmware won’t get you. Their trolling becomes super obvious really quickly.