Parallels representatives in San Francisco would not confirm if the automatic Windows 10 migration tool would work with a pre-installed copy of Windows, like what you get when you purchase a new PC, and told me that users should check with the licensing agreements with Microsoft. The wizard offers several ways to load Windows onto your Mac, including using a free trial version, connecting directly with Microsoft’s servers to obtain a Windows key and pre-fill that key when you’re installing Windows-no more having to copy and paste or type in the Windows serial number yourself-or if you already have a Windows 10 license, it can help you migrate that license, along with all your files, settings and documents, to a virtual machine partition that you set up on your Mac. Parallels is making getting Windows on to a Mac as frictionless as possible, and with Parallels Desktop 13 through the built-in Installation Assistant.