I just upgraded unity from version 3.2 to 3.4 (both free versions).
When I run the new version I didn’t find any difference.

What is the difference between thous versions?

Check out these two links, the differcences between version 3.2 and 3.4 are explained here

link information version 3.2 :

version 3.2

link information version 3.4 :

version 3.4