Does anyone know how to reactivate PT 10?

I just downgraded to Mountain Lion from Yosemite so I can use PT 10 but now I no longer have Pro Tools on my system which I just purchased 2 days ago.



I've tried all of the resources at Avid etc but have had no luck.



Does anyone know how to reactivate it?



Thanks s much for reading. Any help is REALLY appreciated!!!



Steve