Can't seem to register very old purchase

[lar007]

Hello, I've come back to my flight sim after leaving it back in 2006/2007 to bring up kiddies and wanting to get back into it big time again...

I've found everything again including my old copy of fspassengers for fs2004. I've entered my simmarket user and unlock code that I got back
in the days and it says registered successfully and thanks for purchasing, then 10 mins later it says invalid and disables itself.

I've sent Dan a message but just thought I'd ping a question here to see if there's something known or my version is just, well, too old...

Cheers!
Luke.

[Joeflyer]

Wrong authorization message? See the sticky about how to combat it. Otherwise, unintsall FsP, make sure no FsP folder remains in FS9 or FSX, reboot pc
then re-install FsP. Possibly that will work.