In the manga School of Water Business there is a release of chapter(s) 164-168, but there is no group name or volume. I think it might just be a mistake.

No, it's correct. It just used to have a link to a torrent, but due to [sitelink=news.html?id=582]recent policy changes[/sitelink], you can't see the link anymore.

Oh, and we're not going to help you find that release. Against the rules

A just ruler amongst tyrants