I have a mid-2011 27" iMac, into which I have installed a Samsung SSD and formed a Fusion drive of that with the original internal hard disk. There is one partition that takes up all available space and there is no recovery partition. The OS is 10.9.5, Mavericks. I started the Boot Camp Assistant app in the Apps/Utilities folder. There are 2 options: * Download the latest Windows support software from Apple * Install Windows 7 or later version I checked both options, inserted an 8GB USB SD card and pressed Continue. The software proceeded to download the necessary software to the USB drive and then stopped working. A drop-down message appeared, exactly the same as if only the 2nd option above was selected and 'Continue' pressed, viz: "The installer disc could not be found. Insert your Windows installer disc and wait a few seconds for the disc to be recognized." I have tried all manner of insertion of the USB drive, verified the contents etc. but can not overcome this obstacle; the Boot Camp Assistant refuses to proceed further in the process. I cannot form the necessary partition for Windows nor install it, from within Boot Camp, it seems. What to do?