Cannot install Confluence due to missing demo-site.zip

I am trying to install Confluence but the demo-site.zip is missing?

There are some cases where the unzip utility used to unzip the Confluence download will recursively unzip all contained zip files. The demo-site.zip should be located in the WEB-INF\classes\com\atlassian\confluence\setup directory. If it has been extracted, you will see an entities.xml file in this directory instead.