I would like to install my Norton software on my computer but which is not connected to the Internet because I would like to make sure that there are no viruses before reactivating the Internet. Is it possible and how can I do?
You can download from @peterweb's link above but unless it is activated online you will not be able to scan with it.
You can download a 360 installer here. http://www.norton.com/cspn360 Download that to another PC and copy it to your computer. Run the installer and then connect to the internet to activate the product.
I found this requirement under product and services at Official Norton AntiVirus + Norton 360 | View Products (2022)
Set-up: to get the protection/service started, you must download and install on each device and/or complete set-up