Hello UilleamND
There is a space coming in between the word framework in the command: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.fra mework/Versions/A/Support/lsregister
This space should not be present. Please remove this space and try again i.e. use the following command:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -f "/Applications/Adobe Illustrator CC 2014/Adobe Illustrator.app"
Thanks and Regards
Ankit Aggarwal (Adobe Illustrator Staff)