I have Lightroom 4 and would like to upgrade. If I try the free trial of Lightroom CC, it looks like I need to upgrade my catalog. If I decide I don't want to purchase Lightroom CC, what happens to my catalog. Will I still be able to use my Lightroom 4?
It should create an updated copy of your Lr 4 catalog for use in Lr 6/CC (in its own directory). Your Lr 4 catalog will stay the same. Note that the old catalog will not have new photos added when you add to the Lr 6 cat.