If you have lost your activation code you can always recover that from either
if you licensed SPAD.neXt before Nov. 2016:
SimMarket (https://secure.simmarket.com/). Just log into your SimMarket account and check the SPAD.neXt entry
if you licensed SPAD.neXt later than Nov. 2016
2Checkout (formerly avangate) https://secure.2co.com/myaccount/order_lookup/.
you can also log into your 2checkout/avangate account to recover the activation code in case you crated one.
if none of both works, send an email to support at spadnext.com from the email-address that your license is bound to.
(or open a ticket from within spad.next)
Also please note, if you license an additional addon, your activationkey will not change.
Still working on the backlog of tickets. Please bear with me. If you have a licence-ticket that needs urgent attention update it to push it up.