playing ET wolfenstein on a Apple Macbook / iMac ?
There are a couple of steps you can take with the current release to make it work:
Open terminal and cd into your downloads directory for instance (does not really matter but cd ~/Downloads is a good bet) then you download the current apple installation by running "curl https://www.etlegacy.com/download/file/81 -o ETLegacy-v2.75.dmg" because the installer is not signed by an apple developer signature the newer version of OSX assert some security attributes into the file and because of this you need to run the following "xattr -d com.apple.quarantine ETLegacy-v2.75.dmg". You can then open up your normal filebrowser ( Finder ) and just double click on the installer and do the installation. Voilá the game works.