MacOS Big Sur caused siginficate headaches for users looking to install KiCad in the 'traditional' .dmg way
I thought I would outline the (re-createable) steps required to work around these
For starters, this tutorial assuems that you have complete removed previous KiCad install files, and that you have successfully copied/extracted the .dmg. I.e., the following directory structure exists on disk:
➜ kicad.app mv Contents _Contents_hack
➜ kicad.app ln -s ./_Contents_hack ./Contents
➜ kicad.app cd Contents
➜ Contents ln -s ../_Contents_hack ./Contents