Separate names with a comma.
Scrap that, it failed! I managed to get it to work, without selecting install operating system later and then configure settings!
FYI, this worked removing the unattended CD/DVD in Parallels 19.
This is still an issue for me in Parallels 17. VM Resources: 4 CPU's 32GB RAM Ethernet Bridged connection and Shared Network tried. Anyone had...