As much as that would be nice, they'll just say we don't support it (I've had my current serial number not work, and I was told we don't support it so my ticket went unsolved). Since the installer uses Inno Setup (which I also use), you can find an Inno Installer extractor, which will extract the installation files without actually installing the program. Then you can launch TS2009 that way and it should accept the serial number. That's the route I took since my ticket as mentioned, went unsolved.
Cheers