Renewal Dilemma

My renewal for Norton Antivirus V-20.3.1.22 expires in 7 days.  My plan is to upgrade to NIS.  Here is my dilemma.  I have new computer components arriving and will begin rebuilding this 7 year old XP machine to a modern Win 7 machine.  I’m planning on using my old XP hard drive while I set the new SSD up.  

If Norton Antivirus expires before then, does it just stop working all together, or would I be ok for a few days of no updates while I work with my old hard drive and set up the new drive and get NIS set up on the new drive?