Hi, everybody, My brother just got a late 2015 5K iMac and we're hoping to set up Windows 10 using Boot Camp. He's already bought Windows 10 so he has the key ready to go. We downloaded a Windows 10 ISO directly from Microsoft (as the Apple support document suggests) and Boot Camp finds the ISO in the Downloads folder but when we try to proceed it says Need 64-bit Windows 8 or later ISO file. Boot Camp only supports 64-bit Windows 8 or later installation on this platform. Please use an ISO for 64-bit Windows 8 or later installation. I've done the same with Windows 8 on my own iMac but I've never seen this before. It looks like Windows 10 is, for some reason, not supported on this new 5K. Is this the case? I'm talking to Apple at the moment but they said they don't know what's going on. I've attached a screenshot of Boot Camp showing the error. The Apple support document I looked at hasn't been updated since October 6 so doesn't show the new iMac. Could it be a case of us needing to wait for an update?