I tried to do a batch conversion but I get a warning saying that I can't perform this task in 'free mode'. What ever that means.

You are talking about Silkypix - right? Sadly, the software that came with my K10D states in the 'Read Me First" file that it does not support a K10D.

Pretty much useless.
Can someone recommend another program other than Silkypix that will do mass RAW to .jpg conversions?