You can find a database dumps (also known as 'database downloads') at the bottom of Special:Statistics on the relevant wiki.
If there are no download links, or the link is broken or outdated, community admins can request a new update via a button on that page. New downloads generally become available within a few hours, depending on the wiki size.
If no admins are available, please contact us.
More about this topic can be found on this help page.