iPhoto not launching after upgrade to Yosemite, I don't know how to execute the fix
I'm not sure whether that is a true fix or not - however, that file doesn't actually reside in /Library/Frameworks/ it is symlinked from /System/Library/PrivateFrameworks/NyxAudioAnalysis.framework
to
/Library/Frameworks/NyxAudioAnalysis.framework

You would need to replace the original, not the symlink 



The simplest way to get there is…


switch to Finder
 Cmd ⌘   N   for new window
 Cmd ⌘   Shift ⇧   G  for Go to…
Copy/paste /System/Library/PrivateFrameworks/ 
Hit Enter
drag the file in [you might want to copy the original to the desktop first, just in case]
click 'replace'