Plugin renders 3d effects on a plane, by default. In order to setup custom view, you have to create a Camera in Magic Particles and attach it to your effect. In this case AE plugin will use this Camera for rendering.

Start of work
    Install the latest version of Magic Particles 3D
    Copy AstralaxIO.aex into Program Files\Adobe\Adobe After Effects CC 2014\Support Files\Plug-ins\Format
    Copy magic3d_x64.dll into Program Files\Adobe\Adobe After Effects CC 2014\Support Files\

Add the effect into your scene
    Open Adobe After Effects
    Create new file Test.aep
    Create new composition Test
    Import files Test_1.ptc and Test_2.ptc into your project