Slitherine

I don't have a serial number for the default game engine, but I have my other 10 serial numbers, I was trying to use Steam to add them in. I just finished doing all of PzC in about 5 minutes. What or where do I need to do / go to get the 'free' OOB default engine? Or can I just plug in all 10 of my serials after I get the steam key for them?

already posted / replied in other thread

http://www.matrixgames.com/forums/tm.asp?m=4599578

Thanks ditto sorry about double posting.