I have just tried the install with Avast running as my virus protector and there was no problem.
No doubt, when it comes time for my Norton renewal, I will certainly take these events into consideration.
BTW: Deciding to move to another virus/system enhancer should not be much of a problem. Apparently, Norton has removed most, if not all, of their system enhancer features from the basic product and put them into the latest version of Norton Utilities. Not a bad idea except for the price for all past features moving from approx. $40 to about $70. What Now we have to pay an extra $30 for the same support features? No!
Bottom line: No Norton upgrade/renewal for me. Ten years of my loyal support down the drain.
Oh well...
I'm more concerned about how vulnerable Norton is against real threat. How ineffective it is at catching generic threat (50% maybe?). Avast is probably better at the free level. I'd say give Avira a try too.
And the free Malwarebyte is fantastic. You just have to run it manually. If your problem is not being able to know what not to click on the internet what you need is some internet security, but there's no foolproof protection when you click random things like grandma.
The best virus protection is you.