A successful installation shows the NVIDIA dialog box when saving, allowing you to choose compression type (DXT1, DXT5, BC7, etc.).

The DDS plugin allows users to open, edit, and save DirectDraw Surface files—the standard format for textures in many modern game engines—directly within . Version 8.55 belongs to the "legacy" suite of tools developed by NVIDIA for older versions of Photoshop (CS2 through CS6). Where to Download Version 8.55

Since v8.55 is outdated and may not work on modern Photoshop (2020+), consider:

Released originally around 2012–2013, version 8.55 was a critical update for creators working with DirectX-based textures. It allowed Adobe Photoshop users to handle DXTC texture compression and manage complex texture types directly within their workflow.