How do I add playback engine modules?

I recently updated to Unity 5.3.0f4 and I’ve quickly realized that I should have installed more modules than I did. However, there is no way to add modules via the Module Manager. So, I would like to know how to add playback engine modules (or any kind of module, really) to my Unity install.

I have a Personal license.

Its very simple:

  1. Close Unity

  2. Download the Unity installer

  3. Launch it and deselect everything but your missing module(s)
    60113-unitymodules.jpg

  4. Once finished, reopening Unity you’ll find the additional module ready.