How do you transfer solid-works to another device

I have looked online and all I've found was 'deactivate it and reactivate it'. I deactivated it and I have no idea what to do now. How do you reactivate solid-works? Do I need to purchase it again? If so does deactivating it end payments for the previous one? 

Edu ​​​​​​​SOLIDWORKS ​​​​​​​