Norton (owned by Gen Digital) does not prominently advertise the offline installer on their homepage, but it is available through your Norton account or specialized support links.
Once you have secured the offline installer file, follow these steps for a smooth setup: norton 360 premium offline installer
If you need to protect multiple computers, downloading a single offline installer onto a USB drive saves significant internet data compared to running online setups on every machine. Norton (owned by Gen Digital) does not prominently