Norton is a quality anti-malware program that keeps the online threats at the bay. Though this program is quite easy to set up, it sometimes run into couple of technical issues. Error code 8504 is one of those common issues that occur during the installation of the Norton program. In reality, it’s never going to be easy for the new users to fix the installation related issues. So we strongly recommend you to get in touch with Norton Live Service to restore this weird problem quickly.