My late 2013 iMac was pretty badly affected when I tried to download and install Catalina. Apparently, older models have a lot of trouble with Catalina. (Long story.) I now have to replace it.  I will be extremely grateful for suggestions about buying a new computer, with CA 4 and Adobe CC in mind—including suggestions about dumping Mac. If I were to buy a PC, would I be able to open CA4 files that I made on a Mac? That is a huge consideration for me.