I think something is not right with the structure of your zip. I see the same error, but after I unpacked it and created a new zip, I was able to install it on my forum. This is the zip I created: https://drive.google.com/file/d/1nc6Q5GRvIscVz9FJVqJq-Knzoz091TXB/view
I think the way Macs zip multiple folders might be your problem. The parent directory results in about.json being in a subfolder.