I am not totally understanding your issue. Did you ever use Viking software and if so, on what machine?
I still use my old Viking 3d software on an old XP computer. But I cant afford the money for a digitizing (not editing but you can do editing) program so I tried one called Embroidery Ware software. https://www.embroiderywaresoftware.com/embroideryware-downloads/
It is incredibly easy and additive. The guy who created it is very accessible on the Facebook page.
The problem may just be that you need to update the driver for your dongle. Have you done a search online and in the Yahoo groups? It may take some time but i am pretty sure that I have heard people using Win 10 with the Viking programs. Dont give up hope. Just dont expect Microsoft to know anything and Viking will never offer help bc they want you to buy the newest software. Do some searching online and ask questions on any help site that you can find.
This is some old advice I read:
Check device manager for dongle drivers and see if there is any conflict with drivers..if you see a yellow exclamation mark than correct drivers are not installed..uninstall the driver for dongle and use http://windowsupdate.microsoft.com/ and see if there is any drivers for dongle.......let me know if this works