MacBook Pro with OSX El Capitan, Parallels 10, Windows 10 version 1511 build 10586.589. Windows is now trying to update itself via the large Anniversary Update 1607, but the following dialog appears and Windows reverts to the previous version. Can anything be done? "OSX has prevented the guest operating system from changing the boot loader on your physical hard disk. (...) For security reasons this operation was blocked by OSX (...)"
