Install/Update: How much connectivity is required

I'm currently using a different solution that (at present time) will not auto update.  The auto help's solution is "update immediately" and there live chat with tech support isn't much better.  So I'm considering returning to Norton Security but have a couple of questions.

 

If I purchase Norton Security from a retailer will I receive a install disk or just an activation code?  Will the disk contain an offline installer?  Can I down load threat updates at work (where the internet service is fast and reliable - opposite of my service at home) and install them at home?  I guess it all boils down to: because my internet service at home is garbage; can I install and do virus/threat updates off line?