Hi, I run Windows 10 natively on a Macbook (not via Bootcamp). i.e. Windows is the only OS on the machine. I have installed Parallels VM on Windows, and want to run OSX (El Capitan) as a VM from within Windows. Is this possible and how do I acheive it? (I ask because Parallels expects a startup disc to install an OS, but OSX is a download direct to the machine)