Labview only upgrade your vi to the newest version if it is been saved. In other words, if you opened a 6.02 version vi but did not save it, then you should be able to open it in 6i. (if you did a mass compile with 6.02, then use the following method) If you already save it, well, you can save the vi again to v5, open it in 6i and save.
Joe