2nd hand d640

Hello,
I just get a 2nd hand StepCraft d640.
So happy but I can't run it 🙁

I have the UC100 USB dongle with it.
But the guy I bough it from wasn't able to provide me the UCCNC installer and the licence key...

I don't know what to do..
Should I purchase a new licence on CNCdrive shop? Or on stepcraft shop? (but stepcraft only sell the full package with the UC100 dongle, I don't need it)

I'm a bit lost...

Thank you!

Greg