You do have the V2 version? It's still possible to use e-licenser for the products that require this activation. Older V2 versions from V-Collection 3 i hink can use your dongle, but i'm not sure.
No matter what, then you'll need have informations about your product. If you don't have the informations, then i don't know if Arturia can help either.
I would think you had and account where you registred your product, at that you still have it. But perhaps it depends on what you did then. Even elicenser need a product code. Don't you have the info on your dongle still? If not, then you can try to contact Arturia support directly. But i will assume they need some kind of info that show, that you own the product, to be able to help you at all.
Good luck.