If you need to create a bootable USB drive (the standard .dmg method), use this Terminal command after the installer is in your Applications folder:

: If it contains a .pkg , run it to place the "Install macOS Big Sur" app into your Applications folder.

macOS Big Sur (version 11.0) introduced a redesigned interface, Control Center, and optimized Safari. Version 11.2.1 arrived in February 2021 as a point release focused on . Its primary purpose was to fix a specific charging issue with certain 2016 and 2017 MacBook Pro models, preventing them from not charging to full capacity. It also patched a WebKit vulnerability.