I have tried numerous times to install the Xfinity Norton CG for MAC (running most recent version of High Sierra), but encounter the same error messages every time. After using the Norton removal tool to fix the "incompatible version" message, I download the the Norton Installation and begin the process. I get as far as being able to install the "helper tool" and then invariable I get the the message "We're sorry! We've encountered a problem installing this software. Try again later." Anyone have anysolutions to this problem?