Sorry, but you need to be more clear and precise with your description of the problem and, of course, you haven't been really smart posting your Serial Number on the forum. I've obviously edited it but, if someone read it, it might steal your available activations.
In any case, your description of the problem is not clear:
At first, you said first the scenery ran in Trial mode, and then it disappeared after 5 minutes.
This is PERFECTLY NORMAL, since the scenery doesn't register itself, if you buy on the Web. It does if you Buy using the integrated purchase procedure (so you don't need to insert any Serial Number), but since you use the Web purchase on PayPal, it's obvious you have to select the Addon Manager "Register Serial" insert your Serial Number.
You only had to do this, there wasn't any need to install the Addon Manager again. It comes with the scenery, and it was WORKING because, without it, you wouldn't had any Trial to begin with.
Now, you are saying the scenery disappeared. Again, you are not very clear: it's disappearing like in your first description (after the 5 minutes), or it simply doesn't appear at all ?