You can download Nik Collection 5.1.0 from the official website of DxO, the company behind the Nik Collection. Here's how:
Enhanced local adjustment masks that allow you to apply edits to specific areas without complex layering. nik collection 5.1.0 download
If you already own a license for Nik Collection 5: You can download Nik Collection 5
Better organization for user-created presets, allowing for faster batch processing. allowing for faster batch processing.