'Downgrade' iTunes - Library does not open with lower version

I am working with Vector Works 11.5 which requires Quicktime 6.5.1 (it also works with 7.4.3.1). I upgraded my iTunes to the latest version and Vector Works couldn't deal with it. I had to remove Quicktime and reinstall an older version to comply with my Vector Works.
The new version of iTunes obviously couldn't work with the older Quicktime and I installed an older iTunes as well.
My problem now is that I am not able to open iTunes, because the file iTunes Library.itl, which I assume to be the music library can not be read. Is there a way to 'downgrade' the whole setup or to reset the library? I've tried older libraries in the music folder, but that did not solve the problem.
Thanks for any help,
jessie

Rename the current library, open iTunes, and drag the folder containing the old library into the open iTunes window. This will not preserve ratings, playcounts, and other metadata.
(30320)

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