Idk when you tried it last, but it works for me on the iOS app. If you search for something that is a 'region' there should be a download offline map option.

Idk when you tried it last, but it works for me on the iOS app. If you search for something that is a 'region' there should be a download offline map option. In any case, before traveling I try to download the offline maps in HERE wego too.