Bootcamp Error: An error occured while copying windows files

kaan242 wrote:

Hello I'm on a Early 2015 Retina Macbook Pro and want to install Windows inside my machine.

ı got the Windows 10 ISO from Microsoft's site and when I use it with bootcamp I always get the error ''An Error occured while copying windows files''

Newer W10 ISO have this issue. Either find a W10 1511 ISO and use it or install W8.1 and then upgrade to W10 without activating W8.1.

the odd thing is, I also tried this with a Windows 8.1 ISO, and it managed to boot my Mac inside Windows 8.1 with no problems (but I later had to delete it because I can't install Windows 8.1 without a key, unlike Windows 10 it won't let you skip the part where you enter your key.)

You can skip the key. See the explanation about EI.cfg file in https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/windows-setup-edition-configuration-and-product-id-files--eicfg-and-pidtxt .

so, any help? It doesn't have to be Windows 10 I'm ok with any Windows version but seems like my bootcamp doesn't support the ıSO's below Windows 8.1

2015 and later Macs do not support W7. macOS Mojave and Catalina do not support new installations of W8.1.