This is the summary of steps to update your PD Howler 11 to 11.4: Open 'Steam' Click 'Library', to find your Software products, including PD Howler 11 Right-Click 'PD Howler 11' Click 'Properties' Click the 'Local Files' tab Click 'Browse Local Files' Double Click 'Update' to open that new subfolder Double Click 'Howler_11_4_RC131_SSE2_For_Steam.exe' to run and complete the installer. > IMPORTANT: Pay attention to the exact path where you'll install it, especially if not using the default location. See details below. For detailed step-by-step installation, and special notes for installations in different folder or on a different drive than the default location, please read this: http://www.thebest3d.com/howler/steam/11.4-update/index.html