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. This file is required, so the whole process aborts. 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. 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. So, here is where the problem resides: FAT32 cannot handle files greater than 4 GB.
#Windows 10 boot camp installer windows 10
The install.wim contains all of the files for a vanilla copy of Windows 10 and is the largest file in the installer ISO. This is a large file (usually around 4 GB). Windows boots from the OSXRESERVED and shows the available editions of Windows from the install.wim file in the support folder on OSXRESERVED. Sets the boot disk to the OSXRESERVED partition and reboots.
#Windows 10 boot camp installer drivers
These files provide both the drivers needed when installing and the drivers that are installed post-install.
WE HAVE LEFT THIS ARTICLE AND THE DOWNLOAD FOR HISTORICAL PURPOSES.
NOTE: THIS UTILITY SHOULD NO LONGER BE NEEDED DUE TO APPLE UPDATING BOOT CAMP ASSISTANT TO USE EXFAT. Updates Using larger Windows 10 ISOs with Boot Camp Assistant