I've bought both TE2013 and TE4 but I'm having trouble playing them on MacOS Catalina. When I try installing TE4 I get this message: '“TennisElbow4-Mac.pkg” can’t be opened because Apple cannot check it for malicious software. This software needs to be updated. Contact the developer for more information.' And when I try opening the version of TE2013 I've already downloaded I get this message: '"Tennis Elbow 2013” needs to be updated. The developer of this app needs to update it to work with this version of macOS. Contact the developer for more information.'
Not sure why this happens because both games worked fine before I updated my macOS.