Problem downloading maps

For a few months now I've not been able to download any maps from Railyard. Every time I try to download a map, I get a notice saying that there's a problem with "zurich". I did download that map, a fair while ago now, but it's not in my Railyard library anymore. I either uninstalled it and forgot, or it bugged out and disappeared. Every time I open Railyard, "zurich" tries to download. Each time, it either fails with an error message or silently does nothing. Anyways, the Zürich map seems to be causing the problem.

I tried to troubleshoot it by moving all my old save files and the "logs" folder out of the Subway Builder "saves" folder, thinking perhaps that was causing it. Maybe the program was going through the saves, saw "zurich" and couldn't find it, and the broke? I really don't know what I was hoping for, but that didn't work.

I attempted to download Valdotorium's Berlin map about two weeks ago. At the time, it didn't work and gave me an error message. But today when I went into the game, there it was? I don't know how that happened.

I saw also today that Pierreggt released a bunch of other German maps, and tried to download one (Hamburg). Much to my disappointment it did not work, giving me an error message about "zurich" and zip files. I then tried another map (Ruhrgebiet) and got a similar error message (pictured), but this time both had zip problems.

Looking through my files and Railyard/SB settings I tried to look through my "mods" folder in "metro-maker4" and found the "cities" folder for maps. However, Zürich/ZRH was not in there. I don't know what "latest-cities.yml" is but ZRH isn't in there either. "public" > "data" "city-maps" doesn't have Zürich either.

What's going on? Where is this mysterious "zurich" zip issue, and how can I fix it? Is it a problem with my saves, or with Railyard, or something else entirely? Many thanks.