Thanks to the guys at Lakewood Communications, I've updated my tool to move Hyper-V Virtual Machines to allow VMs that do not have any snapshots.
Version 18.104.22.168 also has a minor fix to try guessing the original VM path to replace it correctly in the configuration file. That would mean that you could have detached a VM and could not have attached it back.
On the Win2008 R2 front now the RC is out, for the time being since I don't have any spare hardware to test it on, I don't know if it works or if it still needed. If you do have tested my tool on this OS, please let me know.