Read My post Above ... Traktor 2.0.3 was released BEFORE the S2 Existed so no you cannot downgrade.
http://www.native-instruments.com/fo...ighlight=2.0.3
You might want to download the DEMO of Traktor 2 Rather than Running the CD installer to ensure you get the latest version.
Why would you bother repair disk permissions on a drive you are formatting anyhow?You don't even need Onyx to do this, you can do it from the disk utility.
Bookmarks