I'm attempting to upgrade a Windows 7 SP1 virtual machine to Windows 10 Pro. I'd like to go from 32 bit to 64 bit but that's not a requirement as this VM runs accounting software. I am running Parallels 15 Home Edition on a 2018 iMac with 32 gigs of memory and plenty of free storage. I followed the upgrade steps, downloaded the exe package and ran the installer. I purchased a Windows 10 Pro (32 bit) key from Microsoft directly. After running the installer, I entered the key and was told that the specified key (Windows 10 Pro Full) couldn't be used with this installation. So that brings me to the question - where can one buy an upgrade? Are they even available? If not, and I need to install a new clean version of Windows 10, how do I EASILY migrate all of the data from the existing Windows 7 profile into Windows 10?