Trying to install the official version of macOS Sierra, released today 2016-09-20.
When I use the Parallels Wizard to create a new VM, I selected the
Install macOS Sierra.app application as listed. Next step is saving the
OS X image file.dmg file with its default name in a folder I choose. Then I get the error:
Failed to create a bootable disk image file for this version of OS X.
Running Parallels 12.0.2 on a MacBook Pro with El Capitan.
Ironically, I successfully did this same operation with the second, and last, GM seed from Apple using Parallels 12.0.1. Now, a few days later, I cannot install the official Sierra release with Parallels 12.0.2 (.2 update of Parallels is last day or two). So I suppose either (a) Apple changed something with the installer last-minute, or (b) the Parallels company changed something with this week’s new Parallels 12.0.2 update.
Install macOS Sierra.appwith Parallels 12 seems to be randomly successful. I have tried re-downloading the installer from Apple, and tried each released update from Parallels. For each combination sometimes the install succeeds, sometimes it doesn't… must be related the phase of the moon. If it fails one day, try again the next day.