No sorry I don't have an another PC with FSX. I downloaded and installed the scenery new, but I don't get any certificate in the list.
Maybe I'll explain it better: this is ok, you will have a certificate there only in one of these two cases:
1) You decided to Trust anything signed by us (it's one of the possible options on the *Windows* trust request screen), so you would see a VIRTUALI certificate in the Trusted Authors list, so that would explain why you wouldn't see any more Windows request screen.
OR
2) You decided NOT to Trust anything by VIRTUALI, this would also explain why you wouldn't get Windows trust requests anymore, but then FSX should never allow the module to run, not even once.
What has surprised me is that I no had to enter a license number after installing the scenerys for FSX.All scenerys were correct licensed.
That's exactly what is supposed to happen, the activation of the sceneries is stored on Windows NOT on Flight sim, which means, as long as you don't reinstall Windows, you'll never lose it. And, as explained on every Info page of any product (JFK, for example)
http://www.fsdreamteam.com/products_jfk.htmlThe product is sold as 2 Products in One. This means, by buying one version, you will automatically get the other for free, since activation and serial codes are shared between FSX and FS9.
Which is of course the best and easier way: if you use both FS9 and FSX on the same PC, you don't need to register in both sims, it's enough you register in one and, as long you don't reinstall Windows, the scenery will be active in the other sim as well.
In any case, your activation is fine and it's working as expected, and your problem doesn't have anything to do with activation, because you also see the scenery (and if you lost your activation for any reason, it would *not* disappear, it would revert back in Trial mode).
Your problem is that the fact you Trusted the Couatl program seems to not be saved correctly between FSX sessions, which is also interesting because, we have two modules, the Addon Manager and Couatl, it's strange you see repeated trusting questions about Couatl and not the Addon Manager, considering they have exactly the same digital signature.
Sorry, but I really can't explain it, it's really the first time it happens.
Last check, you please open REGEDIT, and check the value of the following key ?
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing
the default value is 0x23c00 (23c00 hexadecimal). If you see any other value, try to change it to back 0x23c00.