In the last few months, people installing Windows on their Macs with Boot Camp Assistant “An Error occurred while copying the Windows installation files” when using some Windows 10 ISO. I have seen it a lot since I do testing with ISO of Windows Enterprise downloaded from Microsoft that have been showing this problem. It didn’t seem to happen with all ISO so I investigated the issue,, and figured out a workaround to the problem. The Cause When Windows 10 is installed with Boot Camp Assistant, Boot Camp Assistant prepares the disk for installation. To do this, it does the following operations: • Download the Windows Support software from Apple for the current Mac. • Creates 2 partitions, one where Windows will be installed (“BOOTCAMP”) and one where the installer files will reside (“OSXRESERVED”).

Both are formatted as FAT32. • Copies all the files from the ISO that was specified at the start of the process by the user to the OSXRESERVED partition. This is where the error happens.

• Copies the files from the WindowsSupport to the OSXRESERVED partition. These files provide both the drivers needed when installing and the drivers that are installed post-install. • Sets the boot disk to the OSXRESERVED partition and reboots.

Aug 15, 2018 - Which version depends on your Mac's age: Those from mid-2012 and newer support Windows 8 and 10, while models from early-2012 only.

Windows boots from the OSXRESERVED and shows the available editions of Windows from the install.wim file in the support folder on OSXRESERVED. This is a large file (usually around 4 GB). The install.wim contains all of the files for a vanilla copy of Windows 10, and is the largest file in the installer ISO.

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So here is where the problem resides: FAT32 cannot handle files greater than 4 GB. Each new version of Windows increases the size of this file, and ISOs that contain more editions of Windows can be larger than other ISOs that contain less editions.

In step 3 above, the error message “An Error occurred while copying the Windows installation files” is shown because Boot Camp assistant cannot copy the install.wim to a FAT32 filesystem. This file is required, so the whole process aborts. To make matters even worse, the disk in the Mac is left in a state where it is difficult to revert back to a single partition. The OSXRESERVED partition is hidden and unmounted, and Boot Camp Assistant cannot restore a disk that has multiple FAT32 partitions. The Solution To resolve this issue, both FAT32 partitions need to be removed from the disk and a new ISO must be created where no single file is larger than 4GB. We have created a free utility called “Boot Camp ISO Converted” that copies all the files in the ISO to a folder, splits up the install.wim into parts no larger than 2GB, and creates a new ISO that can be used with Boot Camp Assistant. Here is a step-by-step instructions: Removing the installer partitions • Make sure you have a good backup of all files on the disk that could be lost, including all the Mac files.

Repartitioning could fail due to drive errors, so having a good backup is important. • Open Disk Utility, select the startup disk, and click the partition button. • Select the OSXRESERVED partition and click the “-” button to remove the partition. • Select the BOOTCAMP partition and click the “-” button to remove the partition.

• Click Apply to start the partition removal process. Splitting the ISO • Download () and install. • Open Boot Camp ISO Converter and select the ISO that caused the error. • Click Save and specify a name and location for the new ISO. • After the operation is completed, the new ISO can be used to install Windows with Boot Camp assistant following the standard process. Boot Camp ISO Converter Boot Camp ISO Converter uses a command like tool called “wimsplit” to split the wim into parts no larger than 2GB.