acrobat pro 9

Hello,

I bought Adobe CS4 design standard a few years ago and have been using it in my office desktop and my laptop. I just bought a new iMac at home and installed the same copy, but Acrobat Pro 9 does not work only in iMac. When I start the application it shows this message below, and after clicking "continue" nothing happens. I can see only "Acrobat" in the menu and nothing else. Other applications such as Photoshop seem working. I would appreciate your help as it would be nice not to have to buy new Adobe. My office mac, laptop, and iMac all have Yosemite.