Norton Family won't finsih installing

I just signed up with Norton Family and successfully installed it on my son's laptop - a Windows 8 device.  However, when I tried to install it on our other laptop, which runs Windows 7, the download manager keeps putting up a box that says "click retry to continue your install".  When I do this, it keeps showing the same message.  I have uninstalled the download manager and tried again, but the same thing happens.  I have seen similar posts, but haven't seen a solution to the problem.  I'd appreciate some help.