I'm hoping someone can help me with some stupid questions. I downloaded the 30 day trial of Lightroom 3, and now it's up I obviously need to purchase it to keep using it. Now that Lightroom 4 is out it is the only option on the Adobe site which also costs more and I just want to keep lightroom 3 for now. Am I going to have to buy it from a store? Also does the upgrade option work when I only had a trial or do I have to buy the full version?