Mac storage basics · macOS updates and installers
Can I delete .pkg installer files after installing the app?
Short answer: Yes — once a .pkg has run, the software is installed and the package isn't needed. Delete it, or archive it on an external drive if you might reinstall offline.
Yes. A .pkg is an installer package: once it has run, the software is installed and the package itself isn't needed. Delete it from Downloads to get its space back.
Keep a copy only if you may need to reinstall without internet access, or the developer makes old versions hard to find — and in that case consider storing it on an external drive. Disk images (.dmg) work the same way: see deleting .dmg files.