Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the butterfly_generator zip.

Usage

1. Open the Butterfly tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose one of the 54 species, or browse the seven families, and add it at the 3D cursor. You can also use Shift+A, Butterfly.
2. The card at the top shows the species, its wingspan in mm and its face count. Surprise makes a random butterfly, Vary makes another individual of the same species, the palette button picks new colors and the arrow resets the species.
3. The icon tabs hold every setting: Wings (outline, tips, scallops, tails), Pattern (pattern, six palette colors, wear, iridescence, texture size), Body (build, colors, markings, antennae, legs, proboscis), Pose (pose, wing beat speed and angle, fanning) and Swarm & Export (flying swarm, resting swarm, flight along a curve, detail, Convert to Mesh, Delete).
4. For a resting swarm select the butterfly and the mesh to rest on. For a flight path select the butterflies, then the curve last.

The wing beat is keyed on the hidden rig, so it plays without enabling scripts. Convert to Mesh bakes the current pose into a plain mesh.