Capture One Express 6 is now made available for free:-
http://www.phaseone.com/dcm
Via: Peta Pixel
Just follow the instructions provided to obtain the free license and register the product.
Besides, quite some time ago, Adobe had made their CS2 available for download together with "free" registration key in the page below:-
http://www.adobe.com/downloads/cs2_downloads/index.html
However, the page has just been deleted yesterday or the day before, for what I have seen.
It seems that if it is not a server problem, Adobe seems to have decided that this "free" download should not be made available any longer.
Btw, I think the original Pentax Digital Camera Utility 4 is just good enough, frankly. It is simple and easy to use. It does not require very powerful machine to run. Now, it is more stable and reliable than the Photo Browser and Photo Laboratory of the previous Version of 3. The produced Image Quality is quite good. And most importantly, the original Pentax software will give you the most faithful and "accurate" Pentax tasted colours, which is unmatched by other 3rd party softwares.