Hi, Ludmilla
I'm a little confused about what you actually downloaded from the Web. Do you have the URL that you linked from and tha you linked to? If there is a mislabeled download or web page, we need to get that fixed. I'm wondering if perhaps you downloaded plain old Data Studio instead of the Optim Development Studio. Plain Data Studio does not include pureQuery.
In any event, Optim Development Studio is simply the new name for the latest release of what used to be called Data Studio Developer. This is indeed the product that DOES include pureQuery. For more on the various renames and functionality in each product, you can read this packaging article:
http://www.ibm.com/developerworks/data/library/techarticle/dm-0909optimpackaging/
If you have a current license of Data Studio Developer, you can upgrade at no additional cost. Version 2.2 does have a lot of good features, which you can read about in this article on What's New:
http://www.ibm.com/developerworks/data/library/techarticle/dm-0906optimdeveloper/
Kathy Zeidenstein