Hi, Just thought I'd share this. Ongoing issues with Norton Security since upgrading Macbook Pro (Late 2013), to High Sierra. Multiple reinstalls over several weeks. Norton would hang on launch, or Live Update would freeze, continual "Fix" issues and unable to run scans. Found the following on Youtube relating to High Sierra behaviour towards Third Party Developers, running the Terminal Command described allowed me to reinstall Norton Security with Privacy setting "Anywhere" as an option. Norton Security is now behaving normally, Scans both Quick and Full running fine as are all other aspects of the program. Terminal commands and Youtube link for solution:
Allow Apps from Anywhere: sudo spctl --master-disable
Reset Gatekeeper: sudo spctl --master-enable (removes "Anywhere" option)