I did send you an email, sir, but I didn't include any information. What do I need to provide to get it reactivated? 
All the codes you received (please tell me you saved the email), last four digits of credit card (I think), name used to purchase, and (possibly) email used to purchase if you're emailing Alec from a different account. If you're missing a piece of information, don't worry - just send what you have.
Alternatively, is there a way to transfer from Plimus to Steam? >_> I'm not particularly familiar with Steam, so blah.
No way to transfer it, unfortunately, though I'm sure Alec and Derek won't mind if you pay another 20 bucks.

The problem about transferring the Plimus/Ambrosia versions to Steam is that Steam provides services, new features and distribution at a cost of revenue - the transfer would remove this cost.