"Microsoft has partnered with Laplink to provide you with data transfer tools that transfer selected files, folders, and more from an old Windows PC to a new Windows 8.1 or Windows 10 PC.
To get started, download PCmover Express —free for a limited time."
I haven't tried it as I did not need it.
Edit: Added expiration date, thanks to Davedave
I wonder if it's the exact same version offered a few other times previously.