You sure can. I keep my latest version in my "Applications" folder on my Mac and I have all older versions in a Buildbox folder somewhere else on my drive. This allows me to easily go back and work on older games I made in older versions prior to testing it out on a newer version. Also, you may find that a game you're currently working on, doesn't play nice on the latest release for whatever reason, so it's always good practice to keep some older versions of Buildbox to hand. As you can see, I'm a bit of an old BB Hog