unfortunately the old Blender 2.49b has still some import/export functions that newer versions of blender do not have. So I used this program always besides the newest version of Blender. In the past (until Ubuntu 12.04, 64bit) I had no problem to install old Python 2.6 and than Blender 2.49 worked. Since I work on Ubuntu 16.04 (64bit) I am not able to use old Blender 2.49. Is there any solution?