Quit on start (not "crash", crash would give you an error message of some kind), might be due to the fact that you haven't got all the files updated, which shouldn't happen normally, since our installer will always fetch them automatically from the internet.
However, if you got somehow a corrupted file or the connection was interrupted during the download, you might have some files that were updated and some files that are not, and this would end up in FS9 quitting.
To fix this, uninstall KLAS, and reply "YES" to the question if you want to remove the Addon Manager. To be sure it has been properly removed, go into your MODULES folder and verify there are no bglman* files left in there (if there are, remove them)
Then, you can reinstall KLAS and it should work.