Can't install norton security for Mac

Hi, when i was trying to install norton security for mac, it says install failed, incompatible antivirus software Avira detected. I did installed Avira before, but i am pretty sure i uninstalled it successfully using its official tool. I guess there may be some files that is not deleted completely, can you please suggest me any solutions to uninstall Avira completely in order to install norton security for mac successfully? thank you