1. Just place the camera_plugin.exe where ever you want (I place mine in the Prepar3d´s Module directory)
2. Add the camera_plugin.exe to your exe.xml; the new entry should look like (of course with an adapted path):

<Launch.Addon> Camera Plugin False E:\Prepar3D\Modules\camera_plugin.exe </Launch.Addon>

3. Unitl now you can not modify the keybindings for this plugin. So you have to delete all numpad related keybindings from the Prepar3d´s control setting menu.
4. Start your sim

To move your head you have to use the Shift+(Numpad 0-9 and the Numpad_Delete button).

Shift+Numpad5: Center View Shift+Numpad4: Move Head Left Shift+Numpad6: Move Head Right Shift+Numpad2: Move Head Down Shift+Numpad8: Move Head Up Shift+Numpad1: Move Haead Backward Shift+Numpad7: Move Head Forward Shift+Numpad9: Look Down Shift+Numpad3: Look Up Shift+Numpad0: Look Left Shift+Numpad_Del: Look Right

(Does anyone need roll?)

If you setup a view position you like you can use Ctrl+(Numpad 1-9) to save it. To move your head to a saved position just use Numpad 1-9.

The viewing positions are saved per aircraft. So you can define a camera set for each. The camera positions are saved in a file named "camera_definitions.cfg" located in the same directory as the camera plugin. So you also can share it.