Problems running Fusion 6.4 - no valid license?

I'm having trouble running Fusion x64 6.4.

It says Fusion could not find a valid license, Serial number: No Dongle found

I did not use a dongle for Fusion 6.4, I used DFusion.dat.

I have my DFusion.dat dated from 8/14/2014 which is a full license from Eyeon for v7 installed inside of License path: C:\Program Files\eyeon\Fusion 6.4.0.1118\

Possibly this has to do with the BlackMagic version of Fusion I installed?

I have the Black Magic Fusion Studio dongle on my computer, and I'd previously installed version 7.7.1? Fusion Studio 7.7.1 will run fine, so ... it sees my dongle.

I took a break for a long time from Fusion, and I'd like to get back into it, but ... I really need to see my comps in 6.4 as that's what I know before I move to 8.1.

Of course, some of my plug-ins will never work in 8.1, so ... for that reason, I'd also like to get 6.4 running again.

And I just tried to run Fusion 7.0.0.1450 (the last one from Eyeon), and I get the same dongle issue?

I'm still running Windows 7.

What can I do?

Also, if I upgrade Win7 to Windows 10 - will Fusion 6.4 still run? I have scripts and plug-ins that I only have with Fusion 6.4, so I need to keep it functioning?

Thanks!

Do you have the Eyeon dongle installed?

I only have the Black Magic dongle.

For Fusion 6.4, I always used the DFusion.dat, which was tied to the mac address of my machine.

So, I have never had a Fusion dongle, only the Black Magic dongle for my Studio license.

my 6.4 needed both the .dat file and a dongle before it would run.