In November 2014 The Witcher for Mac was updated and doesn’t use Wine any more.
The builds on digital platforms like GOG.com and Steam were swapped and when you download the game from them you get the latest build. However, as it’s impossible to swap builds on already existing discs those who have the disc version, or those who downloaded the game before the swap and haven’t updated it will still have the old Wine version.
The old Wine version will not run on El Capitan.
To gain access to the new version of the game if you have the old Wine one:
- on discs use your Game Code on gog.com/witcherbackup and download the Mac installer from GOG
- on GOG either update it via Galaxy or download and install the game anew
- on Steam switch on updates