Just "x" out of the error and "x" out of the pop-up as you normally do, has absolutely no affect on the program itself. Dell Inspiron 17 5759 Windows 10 64bit Firefox v.51.0.1 ; WLM2012; Avira Free, Windows Firewall, MBAM, Spyware Blaster, SUPERAntispyware 2.
A lot of times I am online and on a site before Avira begins it's update.
That script error only happens on their pop-up notifier ad when the program updates, not something you need anyway so it can be ignored.
Open Explorer, under internet options, choose LAN settings, and under proxy server, make sure the box is UNchecked for Use a proxy server for your LAN. I'm using it now but that 1st update took forever to get through even on a fast ISP link, so it appears its at their end causes the issue. Right, now still on the Zone Alarm Firewall screen, click on View Programs. I believe Avira's servers are in Europe and it frequently helps if you set the update for a time when the rest of the World is sleeping..
The final outcome, the updates do come just try at different times, if not automatic then manually. Scroll down the list until you locate "product updater". If you highlight one you will see the path C:\Program Files\Avira\etc. Change both their Smart Defense settings to Custom.
I have been using Avira Antivir free edition for some time now with no problems. I tried to manually update several times to no avail.