Cannot install Norton Family on Windows 8.1

Hi

I am trying to install Norton Family on Windows 8.1 with no success.

I have done as follows, being connected as an administrator on my windows 8.1 laptop:

1) I logged on to Norton Family, clicked on "Add device", downloaded the installer, run the installer.

2) it run fine then halted, asking me to retry. I have retried many time with no success

3) I have looked for "C/Users/Public/Public donnwloads/Norton" folder and deleted it

I run all steps 1, 2, 3 several times with no success.

Help please! What am I doing wrong?

Thank you.