Thanks for your reply.
Ok, I tested again with latest nightly NETGEN-6.2.2105-154-gc63a865e, the app didn't crash but the tetmeshing failed.
**Log**
Load STEP geometry file C:/Users/Mostafa/Downloads/FullBeam_V3_SW (1).STEP
Preparing visualization (deflection = 0.01) ... done
Building topology tree ... done
Starting geometry healing procedure (tolerance: 0.001)
- repairing faces
- fixing small edges
- fixing spot and strip faces
- sewing faces
- making solids
Compounds : 0 (0)
Composite solids: 0 (0)
Solids : 1 (1)
Shells : 1 (1)
Wires : 6 (6)
Faces : 6 (6)
Edges : 12 (12)
Vertices : 8 (
Totol surface area : 1.68e+06 (1.68e+06)
Preparing visualization (deflection = 0.01) ... done
Building topology tree ... done
Face 1 / 6 (parameter space projection)
Face 2 / 6 (parameter space projection)
Face 3 / 6 (parameter space projection)
Face 4 / 6 (parameter space projection)
Face 5 / 6 (parameter space projection)
Face 6 / 6 (parameter space projection)
Delaunay meshing
Delaunay meshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
start tetmeshing
Stop meshing since too many attempts