I don’t know why a have this virus. Recently I was trying update my MacBook Air to BigSur, but 3 hours later this MessageBox appear to me, I was trying to find solution on Google but I didn’t find it. I trying to install several Antivirus but literally I can’t, perhaps is the virus that don’t allow me do that. At this time I turn off the wifi. Someone knows where can I find that file? What can I do?