The new ManuelBastioniLAB is named MB-Lab.

The ManuelbastioniLAB add-on was a free and open-source character editor human and will reborn with the name MB-Lab.
Is working very well with Blender 2.90.0 and today I tested.
First if you want to used it then download it from the official website.
Open the Blender 3D software and from main menu: Edit - Preferences... select Add-ons and Install... button and select the downloaded zip file.
You can see in the next image the install of the Characters MB-Lab setting area where is need to be check.

Press the N key on your keyboard to see the all features of this add-on. This is the result of the default Create character button and you can tested with all of these settings.