Welcome! K-S2 is a nice camera. Set it to raw (Info) and dng (in Menu)
Originally posted by Skd5509 I did try using the Ricoh imaging software from the cd I received with the camera, however it is too basic
Really? Its quite complex and powerful imo. Lightroom is not much better, just easier to use (sightly worse with Pentax colors), from what Ive seen
Anyway, update your Lightroom and Adobe Camera Raw (ACR) to the latest version that you can.
You can use the free Adobe DNG converter to maximize compatibility, but K-S2 dng files should be directly compatible,