I found this
Live 9
Start Live, open the Preferences' “Library” tab and write down the “Installation Folder for Packs" and "Location of User Library" paths.
Uninstall Live via the 'Control Panel/Software' (Win) or remove the application folder (Mac OSX).
Open Windows Explorer (Win) or Finder (OSX) and browse to the Packs and User Library locations that you wrote down previously.
Delete these folders - please make sure you have not stored any personal data inside the User Library.
Delete all the Ableton folders mentioned below.
Do I have to think about any reg code or something, or is it just installing it on my New Mac Pro like nothing happen ?