Abstract Olympus Viewer 3 (OV3) is a proprietary image viewing, raw conversion, and editing software designed for Olympus (now OM System) digital cameras. This paper provides a step-by-step guide for Mac users to download, install, and troubleshoot Olympus Viewer 3. It also highlights system compatibility, common issues, and alternative software solutions for macOS users. 1. Introduction Olympus Viewer 3 is a free, powerful tool for photographers who shoot in Olympus Raw Format (ORF). Unlike many third-party editors, OV3 applies Olympus’s in-camera color profiles, art filters, and lens corrections with high fidelity. For Mac users, however, obtaining and installing the correct version can be challenging due to changes in macOS security policies, discontinued direct links, and the software’s age. 2. System Requirements for Mac Before downloading, ensure your Mac meets these minimum requirements (based on OV3 version 3.x):