I'd call a Bernina dealer. I know that for 5D pro I can have it on two machines at a time. If I want to put it on a 3rd I have to unregister it on one of the other two. As far as the dongles you really should hear it from Bernina as to what the policy is. I doubt it that she can keep one and sale the other because you get a discount on the upgrade. I'd either contact Bernina or a dealer that specializes in it. Be careful with this; it's alot of money if you can't use it. I'd then take my laptop with me and try the installation at her house or get some kind of money back if you can't install it. I had to do that with a card reader that should have been able to work on my pc; it didn't so the LQS refunded my money.