My Battle.net is at version 1.4 and won’t update any further. When I try to update via Mac Informer it gives me an error.
Yes, the 1.12 is the latest version of the client. I've downloaded the ZIP package from the official website and installed it on a Mac device. Although it says 1.4 in the client, the software's version is actually 1.12. You can obtain the latest one from the Battle.Net website.