1. Unzip all files

2. copy "springmagic" folder into Maya scripts path, i.e.
    "C:\Users\YOUR_USER_NAME\Documents\maya\scripts"

3. Start Maya and run command below in command bar with Python way
    import springmagic
    springmagic.main()

4. Optional: use the shelf button in the tool window to add a shelf shortcut.
   When upgrading from 3.7 or older, delete the old shelf button and create it
   again (old buttons break UI callbacks on Maya 2020 and older).