What Cinema said....
: ^ )
I heard your demo. Divas.
Haven't heard enough yet. The whistle voice isn't really a part of your singing range. It's kind of a separate thing.
So you might be an alto that can go into whistle voice. Don't get too focused on defining what to classify yourself as. That becomes kind of a limiting caste system. Your voice will grow, anyway, so just be you and start building your voice.
I went to start it right when I purchased it and I ran into some issues with WinRAR. So I had to download a new trial version to use UNTIL I can get the actual license. Now that I have the latest WinRAR, lets see.