Important Security Update

After receiving the email from Netgear about the security upgrade I followed the links. When I tried the link below the status bar moved about 20% and stopped.  It hasn't moved any more in about 30 minutes.  Don't know what to do and I could find a satisfactory in the forum.  I am running an xfinity modem, an iMac with macOS High Sierra 10.13.2.

I haven't had any major issues with the extender but I do have to restart it occasionally.

Any assistance would be greatly appreciated.

• ▪Mac OS X or iOS:http://mywifiext.local