Hi, I am unfortunately in the same boat, but CA5 is windows only. There are a few options. If you have an intel mac, you can install windows via bootcamp and use version 5 that way. Or if you are on an m1,M2 ETC, you can use paralles to run it. Other wise you will have to use version 4. They dont sell version 4 on the website, but I was told you can email customer service and they could sort you out with version 4.