Pikmin 2 Not Extracting

So I wanted to play Pikmin 2 on my Gamecube emulator, Dolphin. BUT I can't remove the files from the .7z file. I am on MacEl Capitan 10.11.6 and am trying to use The Unarchiver to open it. I am downloading Pikmin 2 from Ep, so i assumed it would be a good dumb. Can someone please answer me?

Try keka different unpacker https://www.keka.io/en/