Sorry about the delay, Box2DFlash 1.4.3 has been done for a few days now, but I've been too busy to do the extra examples I wanted to include before releasing it.
So I've uploaded the source (without new examples) here. http://skatehed.ho8.com/flash9/143/Box2DFlashAS3_1.4.3.rar
(The package has been renamed from 'Engine' to 'Box2D', so you might have to do some find-replace 'Engine.' with 'Box2D.' on any code you had previously written)
Also note that it has been switched over to pixel units, so two of the examples are messed up, and you might have to make some changes to your own code if you want to use pixel units (or b2Settings.as to switch it back to meters).
Let me know if you have any trouble with it.
The 'Example' demo has been replaced by Seymour's example which exhibited a bug under 1.4.2 that has now been fixed (Great work Erin!).http://skatehed.ho8.com/flash9/143/PhysTest.html
The official release will still be coming fairly soon, but I figure most of you don't need the new examples.