I installed Intellij Idea Ultimate 2016.2 via Ubuntu Make. How can i upgrade to the latest version "2016.4" via Ubuntu Make?
This can't be done using umake, here's a link to the closed github issue How to update installed software?#122. As mentionned you only need to remove the package and reinstall it like this.
umake --remove ide idea && umake ide idea
I posted a way to update all your umake packages at once in this self-aswered question How to update all your ubuntu-make packages?