Apple - Can't Remove "Install MacOS High Sierra.app"
Answer : I was experiencing this problem after downloading High Sierra to fix a friend's Mac. I found Rick's solution worked for me, but I've added a few more steps. Click the symbol in the Menu bar. Click Restart…. Hold down Command + R to boot into Recovery Mode. Click Utilities. Select Terminal. Type csrutil disable . This will disable SIP. Press Return or Enter on your keyboard. Click the symbol in the Menu bar. Click Restart…. Extra Steps Log in / boot up the Mac. Empty Trash. I also found that somehow Previous System folder appeared under the Mac HD. So I also trashed that (which wouldn't trash previously). I then rebooted the Mac a few times to check that everything was working fine. Then rebooted into recovery mode. Hold down Command + R to reboot into Recovery Mode. Click Utilities. Select Terminal. Type csrutil enable . This will enable SIP. Press Return or Enter on your keyboard. Click the symbol in the Menu bar. C...