Hi, Welcome to the forum,
If you are talking about FloorPlan 3D V3 then no, it will not be possible.
V11 was the last version of that program and was replaced by TURBOFloorplan which is totally different underneath. The file type is not compatible although it looks and works similar to FP3D but is infinitely more flexible. You will enjoy it.
You could possible import the plans layout from V3 and use it to trace the outline, but that is about as far as you could go I think. It is so long ago that I used V3 I can't really remember it now.
Allan