I don’t think this is the right thing when we open an online zip file . when I open other zip file in other similar service, it won’t happen. Or is there any particular limitation for render’s static service?
I would try adding a custom HTTP header for this path (or all *.zip paths) to set the Content-Type to application/zip. The trouble is the content type for this isn’t set so the browser is just displaying the binary data in the browser window. If you right-click the page and use “Save As” and save it as a zip file, it would be fine.