"Won't update" is usually related to some kind of messages in the updater/installer log window that would suggest some kind of error/problem so, please, provide with that, or at least some kind of description of what's happening during the update.
If you download the Offline installer ( it's Offline so, clearly, it must be re-downloaded at every new version ), it's just not possible it won't be able to update at least the program code, which surely includes the latest internal airplane database, which seems to be your issue, unless you also saw something suggesting it didn't run, like a message from the antivirus blocking, or something like that.