Q: Your bootable USB drive could not be created.

Bought new macbook pro 2015 with OS 10.10.5.

Using Boot Camp Assistant & faced this error : -

"Boot Camp only supports Windows 8 or later installation on this platform. Please use an ISO file for Windows 8 or later installation."

This error keep on coming every time even i have unmounted the image form disk utility also.

Kindly suggest solution for this problem.