Nina and Alex are rigged with Autorig pro.
What's in the zip file:
You'll have 2 addons included, proxy_picker.py and rig_tools.zip, both for blender 2.79 and 2.8.
Two blend files per character, one suited for 2.79 and another one suited for 2.8, with materials ready for eevee (and working for Cycle as well).
Two blend files with both characters together, one suited for 2.79 and another one suited for 2.8, with materials ready for eevee (and working for Cycle as well).
To enjoy all funcionalities, install the addons proxy_picker.py and rig_tools.zip, unless you already owned the autorig pro addon. Installing autorig pro and rig_tools.zip at the same time will cause problems.
Be sure you have check the Auto Run Python Scripts in User Preferences/Files.
You can now append Nina and Alex in your scene.
You can enable the mask for the body corresponding to the clothes. However, be aware that this will increase the ftp rate.