MAC
macOS Installer / Software Update - macOS
AppleSoftware Update, App Store and .pkg installs
/var/log/install.log1 log location · macOS
macOS Installer / Software Update logs to /var/log/install.log on macOS.
Paths are printed exactly as macOS Installer / Software Update writes them. Environment variables like %LOCALAPPDATA% and $XDG_STATE_HOME are never expanded, so a path can be pasted straight into a shell. Where a path differs between installer types or shipping flavours, each one is racked as its own card below - why that happens.
Finding your way around macOS.
/var/log/install.log