Please follow these steps inside a recent version of Blender (2.83 and above)

Go to 'Edit>Preferences>Keymap

Press 'Import' and choose 'Anatomy-shortcuts.py'

Go to 'Edit>Preferences>Add-ons'

Check the '3D View: Stored Views' checkbox

Check the '3D View:MeasureIt' checkbox

Go to Edit>Preferences>Navigation

in 'Orbit and Pan', Check 'Orbit Around Selection'

in 'Zoom', check 'Zoom to Mouse Position'

Go to Edit>Preferences>System

and choose 'CUDA' if you have it, and check both the processor and the Graphic Card

Then close the Preferences window

-With the Mouse cursor above the 3D View-

Press 'N'

to open/close the Menu

In 'Stored Views', press 'Initialize';

the cube-icons now activates the Stored Views

In 'MeasuIt Tools', press 'Show';

the labels of the selected bones now appear

VIEWPORT DENOISING

In order to get a smooth viewport display, without the noisy shadows and the flickering effect when orbiting the view:

-Go to the 'Properties' window

-in the 'Render properties' panel>'Sampling'>'Viewport':

Reduce the number of Samplings to zero, and check the 'Viewport denoising' checkbox

Then open 'z-anatomy.blend' and allow scripts.

The 'z-anatomy' script in integrated and registered and should be automatically activated.

This script maintains the lights on when isolating structures with 'Shift+H'.

If, for any reason, it does not, go to Preferences>Add-ons>Install, find the 'z-anatomy.py' file, and check the checkbox.