Make sure the permissions are set to "Anyone with the link can view."
If you found this link on a random site, be careful! ZIP files can sometimes hide malware. It's always a good idea to scan them with a tool like VirusTotal before opening or sharing them with your readers. Just let me know what the file is about! Add zip file to blog post? | WordPress.com Forums Download File 1qsjrkxcp723.zip
If this .zip file contains a tool, a template, or a set of resources you've created, please tell me: Make sure the permissions are set to "Anyone