Download from there instead
http://steamreview.org/BlenderSourceTools/

$concave keyword for collisionmodel, but you better make separate convex parts to different prop models

Send it here please

Remove lids bones in smds after exports

It exports the collection instead. Happens after upgrading Blender and addon.

Steps:
Add armature
Move to any collection
Add action with bones keyframes

Expected:
Export buttons suggests to export action as animation or export selected objects or scene

Got:
Export buttons suggests to export selected armature's collection or export selected objects or scene (it exports reference armature)

Blender Source Tools 3.2.5, Blender 3.6.2

You don't need these bones

Merge armatures. In Edit Mode reassign hair bones roots parent to head

https://developer.valvesoftware.com/wiki/Collision_mesh#Smoothing

Not hitboxes, physics mesh.

There are no smoothing groups. Instead, an edge is marked as sharped.

For physics mesh, set smoothing to smooth.

There's also Export Filter that accepts wildcards