An error occurred while copying the Windows installation files

i have MacBook Pro (15-inch, 2016) mac os mojavi 10.14.1

i am trying to install windows through boot camp assistant

i downloaded the latest version from here تنزيل صورة قرص Windows 10 (ملف ISO) . Win10_1809Oct_English_x64.iso

then trying to install windows through boot camp assistant but i found a problem

i tried 4 times to install and every time i face this message

An error occurred while copying the Windows installation files

MacBook Pro TouchBar and Touch ID, macOS Mojave (10.14.1), null

Posted on Nov 15, 2018 11:56 AM

Top-ranking reply

Chris The Bipolar Bear

Level 1

18 points

Posted on Nov 16, 2018 10:33 AM

I have had this problem and done some investigatio. The actual ISO has increased in size and when the boot camp assistant formats the drive as FAT32 which has a file size limitation of 4gb unfortunately the install.wim in the sorces folder is bigger than 4gb hence it fails. The only work around is to download windows 10 1803 then update within window. I have reported this to both apple an Microsoft. Hope this helps

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20 replies

Nov 17, 2018 5:37 PM in response to ibrahim.gaafar

Nov 17, 2018 3:01 PM in response to Loner T

yes, BC Assistant build my OSXRESERVED partition

i tried this method but it failed Apple mouse, trackpad, or keyboard isn't working in Windows and couldn't complete the instillation

1. Star Boot Camp like normal.

2. Go to the point of failure where you get the error message.

3. Boot Camp will attempt to roll back the parition, but close Boot Camp so those two new partitions are kept. They are named OSXRESERVED and BOOT CAMP.

4. Use Disk Utility to erase the newly created “OSXRESERVED” partition, and with the erase feature, choose the ExFAT Format. (This format will allow you to write larger files than the FAT 32 format)

5. Manually copy all the contents from the Windows 10 ISO to the OSXRESROUCES volume.

6. Restart your Mac and enter into the boot selector (hold option key while restarting).

7. You’ll see an option called “Windows” to boot from. This is the installer.

Loner T

Level 9

59,536 points

Nov 16, 2018 3:58 AM in response to ibrahim.gaafar

Did you enter your Password or use Touch ID to allow Bootcamp to install the helper?

Nov 16, 2018 11:14 AM in response to ibrahim.gaafar

using your original link for downloading October edition but select from the drop down menu the second option for update.

see picture below.

Nov 17, 2018 1:37 PM in response to Chris The Bipolar Bear

i tried this method but it failed Apple mouse, trackpad, or keyboard isn't working in Windows and couldn't complete the instillation

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An error occurred while copying the Windows installation files