The Connectlkey products all work right up to SMB3. I believe the 5030 does up to SMB2 (but I am not sure on SMB2.1).
Here is how the version break down to different Windows versions.
You can lower the version supported on the server side if needed.
But the biggest issue now by far across the board is username formatting, that is why I suggest taking it from the brackets in permissions, especially in the case of Windows 10 and Server 2012.