Like a couple of others I downloaded optimizer plus 2010, got the dot-net rubish, and never got an email containing any serial number. i think the Flightsim.com staff should take their responsibility and remove this kind of crap from their site. It really seems they are just collecting emails for spam purposes.
The FSim com staff should be aware that this is bad for the imago [image/] of this site. One trusts the files on this site to be okay and neat.