I've purchased the standalone 14 days ago, any possibility to upgrade too or have I to pay again????
You purchased the St.Maarten Standalone two weeks ago to use it in FS2004 correct? The new update to the St.Maarten Standalone for FSX is free for you, just download and install with the same serial key.
The option to upgrade from a TNCM-only purchse to TNCM-Complete is not something I have accounted for. The Standalone only exists because I thought heavy pilots may not care about flying GA into Barts and Saba and I didn't want to charge them for the extra content.
Problem right now is that there has been some confusion (rightly so) about the newly released FSX versions. My thinking is that making a 3rd release of "Barts & Saba" will increase the confusion factor even further
I will keep an eye on this and see how many people post here or email me regarding Standalone to Complete "upgrade".