Open blender and then open the blend file from your downloaded folder.
Or import the vdb's
You can import the vdb's through the volume menu. Shift + A and go to the Volume submenu. Mark all files at the vdb folder with A and import them
The smaller resolution 400 frames-long cloud formation has a smaller motion field but still large enough to fill a complete scene (X: 303 m, Y: 319 m, Z: 31 m). It can be scaled up and down or can be changed in the density and color with the principled volume shader.
$19
The higher resolution 300 frames-long cloud formation has a larger motion field with larger moving clouds (X: 351 m, Y: 415 m, Z: 63 m). It can be scaled up and down or can be changed in the density and color with the principled volume shader.
$19
The smaller resolution 400 frames-long cloud formation + The higher resolution 300 frames-long cloud formation + blender-specific cloud formation