Try
mwtobias@security.org I purchased the CD set when it first came out (very expensive) there is a challenge - response activation system.
Back then I only had dialup and had to leave my PC on for a couple of days waiting for the activation number.
I even kept the PC that it is installed on (Win 98) to avoid the hassle of reactivating it.
One day - about three years after I activated it - I went to look something up and the license had TIMED OUT !!
WTF, I paid a LOT of money for this product and there was a time limit on it. I went and checked all the documentation I had on it and there was NO mention of a time limit. I just figured that since I'd paid for it I could use it for as long as I liked. I would not have had purchased it if I'd known this as I already had the book set.
I wrote to Mr Tobias and got some waffle and was told that I could re activate it but I would be better off updating to the newer version - more $$$$.
Good luck in your quest. Apparently if you have a legit copy you can email your challenge number to "security.org" and they will send the response. Don't turn the PC off till you have entered the response as every time you generate a challenge it is different and so will be the response.
Email Marc first to get the correct address.