If the seller is legit, then contact them they should be able to log on under their purchased e-mail address/login they can then change the e-mail details to your e-mail address and give you a password. You can then logon and reset the password etc. However this assumes that onward selling and transfer is allowed by Alcohol.
If that does not work you could contact Alcohol and explain the situation to them, if you have evidence of the e-bay transaction, it may be possible for them to transfer the license and de-activate the original sellers copy (could be a shock to them). Because Alcohol now requires product activation per license so you need to de-activate and re-activate via their site if you change hardware.