How to import blender file?

I have file *.blend and Blender installed on my computer.
When I put this file to my project, I got error:

Blender could not convert the .blend file to FBX file.
You need to use Blender 2.45-2.49 or 2.58 and later versions for direct Blender import to work.

I’ve just installed Blender today and have the latest version. How can I fix this?

In Blender: Go to File-Export and Export it as a .fbx

Put it in Unity and you’re good to go!