[Install Solved] For anyone wondering how to install this after bintray was killed

[alelievr]

Install steps

• Download and copy the content of the Assets/Common, Assets/Editor and Assets/OpenVDB folder directly into your Unity project
• You'll probably hit some compilation error in LibraryDownloader.cs, you can delete this file as well as its references in PackageMenu.cs
• Now that everything compiles, download the conan_package.tgz file from the wayback machine: https://web.archive.org/web/20210501105509/https://dl.bintray.com/kazuki/conan/kazuki/OpenVDBNativePlugin/0.0.1/stable/0/package/
• To know which hash to download, see this file:

  OpenVDBForUnity/OpenVDBForUnity/Assets/Editor/PackageBuild/LibraryDownloader.cs

  Line 32 in d490602

  new LibraryPackageInfo { target = BuildTarget.StandaloneWindows, arch = "x86", packageId = "07a258b63529b1a6b9517b05bd8057994689b8eb" },

• For example this is the download link for windows
• Extract the archive and copy the lib and bin directories in this directory: Assets/OpenVDB/Scripts/Plugins
• Then reimport the OpenVDB folder
• Drag and drop vdb files directly in Unity :)

Bonus: extract 3D texture from VDB:

• On windows, add this line after the Path.GetDirectoryName:

  OpenVDBForUnity/OpenVDBForUnity/Assets/OpenVDB/Editor/Importer/OpenVDBImporterEditor.cs

  Line 44 in d490602

  var projectPath = Path.GetDirectoryName(Application.dataPath) + "/";

            projectPath = projectPath.Replace('\\', '/');

Click on your VDB file and then Material and finally "Extract Textures"

[cpt-cabbage]

Install steps

• Download and copy the content of the Assets/Common, Assets/Editor and Assets/OpenVDB folder directly into your Unity project
• You'll probably hit some compilation error in LibraryDownloader.cs, you can delete this file as well as its references in PackageMenu.cs
• Now that everything compiles, download the conan_package.tgz file from the wayback machine: https://web.archive.org/web/20210501105509/https://dl.bintray.com/kazuki/conan/kazuki/OpenVDBNativePlugin/0.0.1/stable/0/package/
• To know which hash to download, see this file:

  OpenVDBForUnity/OpenVDBForUnity/Assets/Editor/PackageBuild/LibraryDownloader.cs

  Line 32 in d490602

  new LibraryPackageInfo { target = BuildTarget.StandaloneWindows, arch = "x86", packageId = "07a258b63529b1a6b9517b05bd8057994689b8eb" },

• For example this is the download link for windows
• Extract the archive and copy the lib and bin directories in this directory: Assets/OpenVDB/Scripts/Plugins
• Then reimport the OpenVDB folder
• Drag and drop vdb files directly in Unity :)

Bonus: extract 3D texture from VDB:

• On windows, add this line after the Path.GetDirectoryName:

  OpenVDBForUnity/OpenVDBForUnity/Assets/OpenVDB/Editor/Importer/OpenVDBImporterEditor.cs

  Line 44 in d490602

  var projectPath = Path.GetDirectoryName(Application.dataPath) + "/";

            projectPath = projectPath.Replace('\\', '/');

Click on your VDB file and then Material and finally "Extract Textures"

Did you manage to link the generated 3D texture to a local fog volume? Its just empty for me I'm not sure why.

[alelievr]

Do you mean HDRP volumetric fog? If yes, then you need a specific format (Alpha8) and it's pretty bothersome to convert if you start from an RGBA 3D texture (other than scripting I don't know how to do it).
In later versions of HDRP they added support for RGBA textures so that might work better

[sonicyue]

It works thanks a lot!