Still demo.
You did something wrong.
Installed Stand Alone for FS9 & FSX, I think from the KJFK scenery add-on, then excluded the Bglman & Couti files (day before replaced Norton with Security Essentials, and I known from you that exclusion is not necessary). Did not switch off real time scanner.
As I've said already, the antivirus is NOT AN ISSUE! If you see the scenery, and it says it's in Trial, and you see the Addon Manager menu, it means THE SOFTWARE IS RUNNING, this means you should stop worrying about the antivirus. It's NOT an antivirus problem. If the antivirus is interfering, you wouldn't see ANYTHING, no scenery, no Trial message, no Addon Manager menu.
If you see the scenery, the Trial message and the Addon Manager menu, it means the software is working CORRECTLY, you are simply failing to register it.
Downloaded & installed Fort Lauderdale FS9 ( right click for install as administrator).
Not need to, since the installer is flagged to automatically run as Admin anyway (see the shield icon?)
Started FS9 via icon on desktop. Within a moment had a CDT ??. Compatibility airport & FS ? What I meant when I wrote FS9 fell out.
Not normal, doesn't happen. However, you said it worked on the 2nd launch...
Started FS9 again, which worked normally, and went to ADD-ON & via FSDT KFLL ticked re-install ( told to go to window mode).
Normal, since it's telling you to go into Windowed mode, it clearly means it's *working*...
Entered serial key then went back to full screen. No mention of activate.
As I've said in my previous message, if FS9 goes back to normal flight without asking anything, it can only means you selected the WRONG product from the Addon Manager, or you have inserted something that doesn't have anything to do with your Serial Number, like your Order Number for example.
2nd attempt went to window mode and ticked register entered the serial number when asked but did not get any message to install airport
Could the mistake be that I ticked re-install in the first attempt ?
There's no real difference between "Register Serial" or "Reinstall". The only difference is: "Register Serial" will ask for your Serial directly. "Reinstall", instead, will walk you to a dialog asking first if you HAVE your email receipt, and if you reply NO, it will tell you how to retrieve it, but if you reply YES, it will ask your Serial Number, EXACTLY like the "Register Serial".
With the attempt I did not get any error messages.
As I've said in my previous message, if FS9 goes back to normal flight without asking anything, it can only means you selected the WRONG product from the Addon Manager, or you have inserted something that doesn't have anything to do with your Serial Number, like your Order Number for example.
Shall I remove KFLL (V. 1.2) from ADD/REMOVE programme & re- install?
You don't have to remove anything, because it's all working normally. It's just you are inserting your Serial Number entirely wrong, or you are inserting something else in place of your Serial Number,
Your Serial Number is a long code that usually starts with FSDTxxxxx-xxxxx-xxxxx-xxxx-xxxx, it's NOT your Order Number and it's NOT your SKU Number. The Serial Number is listed on your purchase receipt as "Serial Number".