Registering new license on separate pc’s after trial period

Hi

 

My mom and I both bought new computers.

 

When I set the trial activations up, I used my email address on my computer and Norton account, and mom’s own email address for her computer and Norton account.

 

I have now bought a 3 user licence and need to renew on both pc’s in 10 days.

 

I know I can just add the new disc subscription number for my computer, but what do I do about my mom’s?

 

I did try to change my mom’s Norton account to my email address, but it says it can’t as the email address is in use already.

 

With hindsight I probably should have used my email address on both computers when I set them up.

 

Do I need to completely uninstall Norton on mom’s computer and start again, this time using my email address and Norton account?

 

Many thanks.