The settings are in different folders.
Some are in your user folder (it might be hidden) in the preferences:
How to set preferences in Illustrator
Others are in an application support folder (this is for Dreamweaver, just try and replace the Dw references by Illustrator):
Locating your personal configuration folder
There's also stuff in the application folder in a folder called "Support files"
When migrating to the newer version I would first install the new version on top of the old one. You need to be careful when installing, because by default, old versions are wiped.