The software was typically included on a CD-ROM (such as the S-SW61 or S-SW12) provided in the camera box.
If you just need , the latest ACDSee (e.g., 2025 Home/Professional) works fine. A free piece of software alternative for Pentax RAW is FastStone Image Viewer or RawTherapee . acdsee for pentax 20
For Pentax users today, ACDSee is a fully capable and professional-grade solution. Whether you are shooting with a classic Pentax K-5 or the latest Pentax KF, ACDSee Photo Studio offers a seamless, integrated workflow for managing, editing, and showcasing your photography. It respects the past through its long-standing Pentax support while propelling your post-processing into the future with AI-driven tools, all within a single, efficient platform. If you're a Pentax photographer, ACDSee is an excellent choice to unlock the full potential of your PEF RAW files. The software was typically included on a CD-ROM