Apply all object transforms (Ctrl+A > All Transforms) and re-execute the operation. VertexHub may be unstable on child objects or objects with unapplied transforms.

Clear any existing snap settings first (turn off all snap in Blender), then use HiPoly's Snap Tools to configure everything properly.

Switch to Object Mode first. HiPoly Generation only works in Object Mode, not Edit Mode.

Those vertices are likely already connected by edges. VertexLink only creates missing connections - check if edges already exist between your selected vertices.

Not at all! HiPoly is specifically designed to make professional techniques accessible to beginners