Click the Apple in the top left hand corner and select About This Mac Open ist on your desktop with a text editor
If it's not working, I found another solution, you have to edit the ist of the Boot Camp Assistant's package content:Ĭontrol Click or Right Click on Boot Camp Assistant and select 'Show Package >Contents'ĭrag the file 'ist' to your desktop (I also recommend saving it in >another place as well in case you want to revert to the original)
For me the solution was just to Unmount the windows 10 iso.