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Conflict with Avira although it isn´t installed
I tried to install Norton Internet Security Deluxe on my Mac with OS El Capitan. But it was´t possible because the Norton installer gave me an error message which says that I have to deinstall Avira Antivirus program before I can install Norton. "Fun" fact: I don´t have any Avira installed. I also tried the Norton support that was very nice but after 50 minutes of trying to help via remote desktop they gave up.
Is there any hidden file which I have to delete? How can that be possible if I don´t have (and can´t remember that I ever had) Avira installed?
And of course I already purchased Norton Internet Security Deluxe which is now useless. Do I get my money back?