Update to Links to .Zip files are down
WordPress does not specify files that can be uploaded in a ZIP file container, see WordPress Accepted Filetypes, just that you can upload these types if you pay money for a subscription.
I chatted to WordPress about the issue eventually saying EXE files are not allowed in ZIPs. It seems a recent IT change has started scanning the files only on download and rejecting them with the following message:
This site can’t be reached
The webpage at WEB ADDRESS might be temporarily down or it may have moved permanently to a new web address.
When uploading there is no indication that the EXE/BAT in a ZIP file is not allowed which is a strange security choice from WordPress.
For this reason, all ZIP files are now downloaded from OneDrive, all the links in articles have been adjusted, please report if you find any that do not work.