Which CompuServe version works with Mac 10.10?
According to the official requirements posted on their website, Compuserve 2000 works with Mac OS X 10.0.4 or higher. The file format is HQX which means you need the help of StuffIT Expander to unpack the setup file. Access the official website to download the package to install it on your Mac.
Download StuffIt Expander: http://my.smithmicro.com/stuffit-expander-mac.html