You can activate Scaler v1 on up to 3 computers (check the tread here). If you had it only installed on the one that crashed, you should still have 2 activations available.
When attempting activation, have you used the same email address you use to log in to Plugin Boutique? I know it’s a stupid question but, hey, people do change their emails ;).
Anyways, I would suggest opening a support ticket with Plugin Boutique as they seem to handle the authorization part.