Showing my age as well, I have CS4 and a year ago added Lightroom. I'm able to use my version this way, but it doesn't work quite the same. We got our new Mac about 18 months ago and Photoshop is the only app that hasn't updated CS4 to 64 bit. CS4 works well for my uses and I don't use Lightroom at all, finding Photoshop to be much more powerful but this was apparently the only way to contimue to use what I know. Photography isn't my life but I enjoy editing my images for Instagram or sharing them with family and friends. Pooh on Adobe for refusing to support the older versions. We do have the latest OS update for our Mac and every other app works well.