Aperture auto-overwrote its library? ...

I opened 'users' in the Hard drive, selected myself, then 'images' and there was the aperture library. I dragged it over to copy it onto an external hard drive, and a message came up saying: "Welcome to Aperture 2.1.4 Your library needs to be upgraded to work with this version of Aperture. Once upgraded, you will not be able to use this library with previous versions of Aperture." It turns out it was an old library from when I had been using the trial version of Aperture, six or eight months ago. I clicked quit, but the next time I launched my application of Aperture, I got the same message. The only options were "quit" or "upgrade" and I was getting tired of the 'quit' option. I clicked upgrade. Then it opened and the only projects listed were from my trial. I can't find where the last half year of data are stored, there is no other 'aperture library' on in my 'images' folder, and that old one was the only one that was there to begin with. So where are all my images? I'd hate to think that Aperture auto-overwrote all my projects simply because I was trying to back up my projects. I simply didn't realize that 'aperture library' would be a trial from two years ago, otherwise I never would have tried to back it up by drag-dropping it onto an external drive. There are several projects with hundreds of images in each- all MIA.

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