constant guard for windows 10 to download - XFinity

when i originally installed the constant guard to my laptop when starting the account it was started on my fiances HP and his fan burned up his processor so neither one of us canaccess the account and have been trying to do it on my toshiba laptop that is ancient but has updated to windows 10 from win 7 32-bit.
so how can i obtain the right download to my toshiba so i can properly access my account settings and security features?