How to install java.pkg (not unarchiver) When I try to launch MC it says I have to have the latest java (OSX Yosemite)
this is the day after I updated. 

So I download it, open the dmg and then to find out that it is not a jar launcher file (btw I know where it is located and how to use jar launcher). It is a .pkg that opens with the unarchiver. 

I have read a previous post where it says that you need to launch it with jar launcer... I tried that, but it was a fail. 

It said it can't be opened with jar launcher and then I get a console error message. So if anyone has a solution any help would be nice.
The Java installer is a package which installs using Installer. If the package doesn't open by default with Installer then right-click it and choose Open With → Installer.