This should be straightforward with the pro version: you can enable the versioning support with the generation of .meta files. This feature comes for free in Unity 3.5 but was only available with a pro license on earlier version.
Then all you need to do is copy everything under the Assets/ path.
If you don’t own a pro 3.4 version, then your only solution is to make a big package,e export it from 3.5, import it to 3.4 and reconnect by hand any lost connection.
One question: have you consider upgrading the version on the 3.4-license computer?