zechy,
I believe the right order/way is to update the OS, then reinstall the applications. Was that how you did it?
The download is here:
http://support.apple.com/kb/DL1572
Some have found that the page may turn up blank to start with, so it may be necessary to reload the page.
Others have found that it may depend on browser. Specifically, a switch from Safari has solved it in one case.