Software needs exception

I downloaded a scrabble game software from http://www.scrabblepro.com/scrabblepro.php. I had no problem with the download but when it came to  installing it, my Norton 360, stopped the installation and even deleted the executable file from my computer. It is even stopping me from re-downloading. Being very curious I wrote a ticket on the website and told them about it. Their advice was to add an exception. I do not have much experience with software needing exceptions and was wondering how safe it was. My instinct says no but I'm curious as the website  including the comments seemed legit enough.

Any advice would be appreciated.

Thanks.