The "Release Schedule" page has references to 3.2.0, 3.4.0, 3.6.0, pretty old. https://koha-community.org/about/release-schedule/ At the bottom of the page should be a section how to download a version, e.g. with a link to http://download.koha-community.org/ or https://koha-community.org/download-koha/
I have removed the version numbering for now.